Geometrical Optics And Its Applications

Geometrical Optics And Its Applications Optics is the cornerstone of photonics systems and applications. Geometrical optics, or ray optics, is to study the geometry of paths of lights and their imagery through optical systems. Light will be treated as a form of energy which travels in straight lines called rays. When light comes to be regarded as waves, it will be seen that shadows cast by objects are not as sharp as rectili (Ariel Lipson,Stephen G. Lipson,Henry Lipson) (Ariel Lipson,Stephen G. Lipson,Henry Lipson, 2010)near propagation suggests due to diffraction and interference effects of wave. Thus, there is a simple assumption for geometrical optics, which is rays of light propagate along straight lines until they get reflected, refracted, or absorbed at a surface. 2 Fermats Principle 2.1 Background Fermats Principle, also known as the principle of the shortest optical path, was introduced by Pierre de Fermat in the early seventeenth century. This principle is used to state and explain the motion of light ray through different media, which helps to demonstrate laws of reflection and refraction later on. 2.2 Theory The path of a light ray connecting two points is the one for which the time of transit, but not the length, is a minimum. The time, T , for a light ray through space to travel from a point A to another point B can be calculated as: It is known that is velocity, which can also be regarded as for light, where c is the speed of light and n is the refractive index of the medium. Thus, we have Then the path taken by light should be the path that minimizes this integral, which would be: Therefore, it is the fact that light will travel along paths of stationary optical path length, where the optical path length is a local maximum or minimum with respect to any small variation in the path. And many paths will take exactly the same time to travel from point A to point B. (Ariel Lipson,Stephen G. Lipson,Henry Lipson, 2010) 3. Reflection 3.1 Derivation for Law of Reflection In general, law of reflection states that when a light ray incident upon a reflective surface, it will be reflected with an reflective angle that exactly equal to the incident angle with respect to the normal of the surface. Law of reflection can be dervied from Fermats Principle. Assume that the medium of the light travel is homogeneous, we haveC:UsersGaryDesktopà ¦Ã…“ ªÃƒ ¥Ã¢â‚¬ËœÃ‚ ½Ãƒ ¥Ã‚ Ã‚ .png Total path length S from A to B is Based on Fermats Principle we know that light would travel the path with minimum time. As in homogeneous medium, light travels with a constant speed and therefore the minimum time path is equilvant to the minimum distance path, which can be obtained by taking the first derivative of S with respect to x. which is sinà £Ã¢â‚¬Å¾Ã‚ ¥AOC = sin à £Ã¢â‚¬Å¾Ã‚ ¥BOC Thus shows that à £Ã¢â‚¬Å¾Ã‚ ¥AOC = à £Ã¢â‚¬Å¾Ã‚ ¥BOC, the angle of incidence equals the angle of reflection NB: It has to be reminded that the incident ray, the refracted ray and the normal are co-planar. (Philip D. Straffin, C. T. Benson, 1993) 3.2 Specular and Diffuse Reflection In details, there are two types of reflection Specular reflection and diffuse reflection. http://titan.bloomfield.edu/facstaff/dnicolai/images/ImagesPhy106/lesson2.gif Specular or regular reflection is said to occur when parallel rays reflect from a high smooth and flat surface. For instance, a flashlight beam is said to have specular reflection as the reflective surface is mirror which is highly smooth and it, hence, makes the reflected beams travel towards the same direction in parallel as in (a). Most object, however, reflect light diffusely and the rays in an incident parallel beam are reflected in many direction as in (b) because of diffuse reflection. Diffuse reflection is due to the surface of the object not being perfectly smooth like a mirror. In fact, under microscopic scale, the surface of most of objects, if not all, is quite rough. Although at each point on the surface the law of reflection is observed, the angle of incidence and the angle of reflection varies from point to point. Each of the initially parallel rays, therefore, is reflected in a different direction. 3.3 Mirror Concepts and its Applications 3.3.1 Image Formation with Mirrors Mirrors, undoubtedly, are ubiquitous in daily, especially used in mirror and optical instruments for gathering light and forming images. Law of reflection can be applied to use in locating the reflected image graphically as long as the size, location and orientation of the object is known. 3.3.1.1 Images in Plane Mirrors Images with mirrors are formed when many non-parallel light beams are reflected from the mirror surface and converge to form a corresponding image point. Image formed by plane mirror is erect, virtual, same size as the object and laterally inverted.C:UsersGaryDesktopreflection in mirror.png For a point object, in Fig 3.3.1.1a, rays from the object at O are reflected in all directions based on the laws of reflection so that they appear to come from a point I behind the mirror and this is where the observer imagines the image to be. For an extended object, in Fig 3.3.1.1b, the image of a point A on the object is at A, and two points are being equidistant from the mirror. Similarly, the image of point B is at B. The image size, therefore, is identical to the object seize, giving a magnification of unity. However, the right-hand side of the object becomes the left-hand side of the image and vice versa. The image is said to be laterally inverted.C:UsersGaryDesktopmirror extended object.png To conclude, a planar mirror is strictly stigmatic in nature Any incident rays issued from point A gives reflected rays passing through point B symmetrically to A with regard to the plane of the mirror. B, hence, is the image of A. (Katz, 2002) 3.3.1.2 Images in Curved Mirrors There are mainly two types of spherical mirrors, concave and convex. Similar to planar mirror, image can be traced using the law of reflection. Unlike image formed by planar mirror, which is always erect, virtual, same size as the object and laterally inverted, the image formed by a spherical mirror and its nature depend on the distance of the object from the mirror. To construct the image, we assume that small objects on the principal axes of mirrors of small aperture are being considered so that all rays are paraxial. Point images will, thus, be formed of points on the object. For concave mirrors, also known as converging mirrors because of their action on a parallel beam of light, is a mirror with a curved reflecting surface that bulges inward. The formation of image using concave mirror can be in different locations of the object can be concluded by the following figure. Concave Mirror The nature of image using concave mirror and its applications are summarized as below: Position of the object Position of the image Nature and size of the image Use At infinity At the focus Real, inverted and diminished As collector of radiation in solar heating devices Beyond the centre of curvature Between the focus and the centre of curvature Real, inverted and diminished At the centre of curvature At centre of curvature Real, inverted and same size as object As a reflecting mirror behind a projector lamp Between the focus and centre of curvature Beyond the centre of curvature Real, inverted and magnified In flood lights At focus At infinity Real, inverted and magnified As a reflecting mirror in car, head lights, search lights etc. Between the pole of the mirror and the focus Appears behind the mirror Virtual, erect and magnified As a shaving mirror or makeup mirror and dentists mirror (Katz, 2002) For convex mirrors, also known as diverging mirrors reflect the incoming parallel light beams to form divergent beams which appear to come from a point behind the mirror.Convex Mirror Unlike that in concave mirrors, the nature of image formed by convex mirror is always virtual, diminished and erect. (Katz, 2002) 3.3.2 Derivation of the mirror formula Mirror formula is useful when we have to calculate the image location. Using triangles 2 and 3, we have,http://scienceworld.wolfram.com/physics/mimg232.gif While using trangles 2 and 4, we have, Where is the image distance, is the object distance, f is the focal length, is the image height and is the object height It should be noticed that the sign convention is to be used in mirror formula. A real object or image distance is positive while a virtual object or image distance is negative. Magnification of a mirror image, m, can also be calculated by 3.3.3 Mirror instruments 3.3.3.1 Catoptric Systems Catoptric Systems is the system that merely consists of mirrors for the formation of image. (Board, 2012) 3.3.3.1.1 Newtonian telescopehttp://bdaugherty.tripod.com/gcseAstronomy/images/newtonian.jpg Newtonian telescope is the first reflecting telescope invented by Isaac Newton in 1668. It consists of a concave primary mirror and a small flat diagonal secondary mirror. In a bid to have a stigmatic axial image, a concave mirror has to be applied to act as a primary mirror and it reflects light back up the scope axis to the secondary mirror which is titled at 45o to the axis. The secondary mirror, which is a small plane mirror, is placed in the path of beams reflected by the primary mirror in order to divert the rays to one side of the tube. The reason for choosing a small mirror to act as secondary mirror is to prevent the influx of light beams is blocked from reaching the primary mirror. Pros of the Newtonian telescope Cons of the Newtonian telescope Less expensive Reduction of light intensity due to the blockage of central flat plane Shorter focal ratio leads a wider field of view Easily suffer from coma (i.e. an off-axis aberration) Free of chromatic aberration Simpler fabrication (Kitchin, 2012) 3.3.3.1.2 Cassegrain Telescope http://www.vikdhillon.staff.shef.ac.uk/teaching/phy217/telescopes/cassegrain.gif Cassegrain Telescope is another type of reflecting telescope employing two principal mirrors, a concave parabolic primary mirror like the Newtonians, but its secondary one is a convex hyperboloidal mirror. It makes use of the special properties of parabolic and hyperbolic reflectors. A concave parabolic reflector will reflect all incoming light rays parallel to its axis of symmetry to a single point, the focus. A convex hyperbolic reflector has two foci and will reflect all light rays directed at one of its two foci towards its other focus. The mirrors in this type of telescope are designed and positioned so that they share one focus and so that the second focus of the hyperbolic mirror will be at the same point at which the image is to be observed, usually just outside the eyepiece. The parabolic mirror reflects parallel light rays entering the telescope to its focus, which is also the focus of the hyperbolic mirror. The hyperbolic mirror then reflects those light rays to its other focus, where the image is observed. (Waland, 1990) 3.3.3.1.3 Gregorian telescope http://s4.hubimg.com/u/7341531_f520.jpg Gregorian telescope employs concave parabolic mirror to act as both primary and secondary mirror in this reflecting telescope. The light that first enters the tube is reflected by the primary concave mirrors and directed towards the secondary mirror, which is also a concave mirror. It will reflect the rays out to the telescope through the hole in its center. Observer can therefore view the image formed on the eyepiece. (Trà ¼mper, 2010) 3.3.3.2 Catadioptric Systems Catadioptric system, on the other hand, is the system that consists of both mirrors and lenses for the formation of image. (Board, 2012) Catadioptric Systems will not be included in this paper. 3.4 Other Applications 3.4.1 Optical lever and light-beam galvanometers Galvanometer is an instrument that used to measure very small electric currents. Some sensitive galvanometers would use a beam of light in conjunction with a small mirror as a pointer. When there exists current flowing in the electric wire, a tiny mirror that is fixed to the part of the meter will rotate. And a light beam from a fixed lamp falls on the mirror and is reflected onto a translucent scale. For a given current, the longer the pointer (i.e. the reflected beam) the greater the deflection observed on the scale. This simply applies the reflective nature of light wave. (A.M.Badadhe, 2006)http://www.daviddarling.info/images/moving-coil_galvanometer.jpg 3.4.2 Red-eye effect The Red-eye effect is a common phenomenon in photography. It occurs when the photographic flash unit place closely to the camera lens. Normally, the rationale of photo-taking is that light from the flash unit enters the eye and is reflected back to the camera lens. Nevertheless, under dark environment, pupil diameter would increase due to contraction of radial muscle fibers and relaxation of circular muscle fibers of iris under autonomic nervous system and therefore more light beams can enter into the retina of the eye. And the reflected light from the retina is red because of largely blood vessels in Choroid. It, therefore, gives the Red-eye effect in photograph. 3.4.3 Headlight of Carhttps://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiAocxF-72N5opOqRXLXfd1CGTG9rLUKp6-r6dKPFb2CCaxdW2SiK-wldyw1VDA20N_NWu0IlZu1g8WWnhHJ20fPc4I25V-ajUnk4JWWLyQvahd0Fb0lxmrbUOrUpjQU2iN-3Eg4K2o05dx/s1600/infiniti+headlight.jpg It employs concave parabolic mirrors at the front of the car, which acts as reflectors in the head lights of cars, search lights etc. 3.4.4 Dentists Mirrorhttp://cdn7.fotosearch.com/bthumb/FSA/FSA132/x12292469.jpg Dentists Mirror applies reflection to reflect and focus light on the tooth so that dentists can be examined in detail. 3.4.5 Optical Comparatorhttp://www.worldoftest.com/img/products/qv300_1.jpg Optical Comparator is an instrument that projects a magnified image or profile of a part onto a screen for comparison to a standard overlay profile or scale based on the principles of optics. The comparator, basically, is a non-contact device, which frequently used to measure, test, inspect, gauge or examine parts for compliance with specifications. (A.M.Badadhe, 2006) 3.4.6 Security Convex Mirrorhttp://dgmglass.com/images/mirrors/security/mirror-s-3.jpg One of the distinguish feature of convex mirror is the widely view range. Therefore, convex mirror is applied to act as a security mirror in blind junctions of roads or at corners of walls of bug buildings. The person that is approaching from other side would be shown when the mirror is positioned properly. 3.4.7 Rear-view mirror in an automobilehttp://transport-futures.com/wp-content/uploads/2011/04/rear-view-mirror.jpg Knowing that the size of image of an object would be smaller when the object comes closer to the convex mirror, this unique feature can be applied to use on automobiles as rear view mirrors so that the diver can clearly view an approaching vehicle. 3.4.8 Submarines PeriscopeC:UsersGaryDesktopreflecting Periscope.png A periscope is a mirror instrument for observation from a concealed position. It works by employing two mirrors at 45o to each other, reflecting light rays from one place to another and finally out to the persons eye. 4 Refraction 4.1 Law of Refraction Qualitatively, when a light wave, which in fact composed of oscillating Electric fields and Magnetic field, crosses from a low optically density medium, say vacuum into a high optically density medium, say glass, E-Field and B-Fields are altered in terms of magnitude and direction of travel by the charges in the glass. Law of refraction, however, can be proved mathematically as follows: The first medium is supposed to be faster than the second medium and the speeds of propagation in 1st medium and 2nd medium are and respectively, where c is the speed of light in vacuum and n1, n2 à ¢Ã¢â‚¬ °Ã‚ ¥ 1. C:UsersLenovoDropboxU life2012-13, year2, 1st semesterCCST 9042 The world of wavesSnellslaw_diagram2.png Then, we have to evaluate the time taken by light ray from P to Q, which is Based on Fermats Principle, light travels the path with the least time. Thus, in an attempt to minimize the transit time, we set the derivative of time is zero and we have: By trigonometry, we have As and, we have This is Law of refraction, also known as Snell-Descartes law. NB: Similar to law of reflection, the incident ray, the refracted ray and the normal are co-planar. (Philip D. Straffin, C. T. Benson, 1993) 4.2 Total internal reflection According to Snells law, when a light travels from one a medium with a higher optical density, to a medium with a lower optical density, say from glass to air, it will be refracted away from the normal (i.e. Ray C in Fig 4.2a) and a weak internally reflected ray is, meanwhile, formed (i.e. Ray B in Fig 4.2a) C:UsersGaryDesktopà ¦Ã…“ ªÃƒ ¥Ã¢â‚¬ËœÃ‚ ½Ãƒ ¥Ã‚ Ã‚ 33.png Increasing the angle of incidence i increases the angle of refraction r, and at a certain angle of incidence c, called the critical angle, the reflected ray beam just emerges along the surface of the glass and the angle of refraction is 90o (i.e. Ray D in Fig 4.2b). In Fig 4.2 c, as the incident angle is increased continuously above critical angle (i.e. i > c), the refracted angle will be higher than 90o and sin r > 1, which is impossible and no refraction is possible. At this stage the internally reflected ray becomes bright and the refracted ray disappears. Hence, total internal reflection is now said to be occurring since all the incident light is reflected inside the optically denser medium. Mathematically, the critical angle can be found based on Snells law, which is Assume that n1 is refractive index of optically denser medium, n2 is refractive index of optically less dense medium, ÃŽÂ ¸1 is the critical angle of denser medium and ÃŽÂ ¸2 is the angle of refraction in less denser medium. All in all, for Total internal reflection to happen: Light must travel from denser medium to rarer medium. Angle of incidence should be greater than critical angle (i.e. i > c.) 4.3 Thin Lenses Thin lens is a lens that its axial thickness is small compared to the radii of curvature of its surfaces. (I.e. The thickness of the lens is negligible compared with the focal length of the lens) There are mainly two types of thin lenses, Converging thin lenses and Diverging thin lenses. Converging thin lenses, also known as convex lenses, direct parallel light rays bending toward one another after passing through them Diverging thin lenses, or so-called concave lenses, cause parallel light beams to spread as the leave the lens.http://t1.gstatic.com/images?q=tbn:ANd9GcT6lXrPj04wfnztVlEvIlewlbzvIzhu_60Cup8oDYd840MY3w0SiOxnzxaVrQ 4.3.1 Image Formed by Thin Lenses 4.3.1.1 Convex Lens Ray DiagramFormation of Image by a Convex Lens Object is located between focus and lens The image is: Virtual Erect Magnifiedobject at F1 2. Object is located at focus The image is: Real Inverted Magnified 3. Object is located between focus and F2 The image is:object between F2 F1 Real Inverted Magnified 4. Object is located at F2object between O F2 The image is: Real Inverted Same size as the object 5. Object is located beyond F2object beyond F2 The image is: Real Inverted Diminished 6. Object is located at infinityobject infinity The image is: Real Inverted Highly diminished 4.3.1.2 Concave Lens Ray Diagram 1. Object is located between focus and mirrorconcave lens object F O The image is: Erect Virtual Diminished 2. Object is located between mirror and infinityconcave lens object infinity O The image is: Erect Virtual Diminished 3. Object is located at infinityconcave lens object at infinity The image is: Erect Virtual Diminished 4.3.2 Derivation of the lens formula for thin lenses Gaussian lens formula, also known as lens formula, can be derived as follow: http://www.astarmathsandphysics.com/university_physics_notes/optics/university_physics_notes_proof_of_thin_lens_equation_html_5c3e1e20.gif As, (1) Where O is the size of the object and I is the size of the image. Also, Thus, Combine with (1), we have NB: The Cartesian Sign Convention for thin lens formulas are as follow: Light travels initially from left to right toward the lens. Object distance p is positive for real objects located to the left of the lens and negative for virtual objects located to the right of the lens. Image distance q is positive for real images formed to the right of the lens and negative for virtual images formed to the left of the lens. The focal length f is positive for a converging lens, negative for a diverging lens. The radius of curvature r is positive for a convex surface, negative for a concave surface. Transverse distances are positive above the optical axis, negative below (Katz, 2002) 4.3.3 Power of a Lens The optical power of the lens is used to describe the bending ability of lens in term of power. Basically the power of a lens of focal length f is, Power, in the case, can be expressed in m-1as the unit of power is diopter 1 D = 1m-1 Therefore, if there exists a convex of power 1D, its focal length equals to 1 meter. 4.4 Optical instruments 4.4.1 Prismshttp://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Light_dispersion_conceptual_waves.gif/330px-Light_dispersion_conceptual_waves.gif Optical prisms are components that commonly used in optical experimental arrangements and optical instruments, with the role of illustrating dispersion of light beams. Rather than showing the complicated mathematical proof such as derivation of minimum deviation, application of prism will be illustrated below. (Thorington, 2009) 4.4.1.1 Prism BinocularsC:UsersGaryDesktopprism.png Prism Binoculars consist of a pair of refracting astronomical telescopes with two totally reflecting prisms (angles 90o, 45o, and 45o) between each objective and eyepiece. Prism A causes lateral inversion and prism B inverts verticallt so that the final image is the same way round and the same way up as the object. (Thorington, 2009) 4.4.1.2 PeriscopeC:UsersGaryDesktoppp.png Periscope, apart from using two reflecting mirror, employs two prisms. Under the occurring of total internal reflection on the hypotenuse, the incident rays and reflected rays are symmetric with regard to a plane orthogonal to the hypotenuse. In the case of normal incidence on one side of the right angle, the incident and reflected beams are orthogonal. 4.4.2 Magnifying Glasshttp://blog.timesunion.com/opinion/files/2011/02/0217_WVinternet.jpg Magnifying glass, also called Simple microscope, consist of a converging lens forming a virtual, upright, magnified image of an object placed inside its principal focus. For an object of height h is viewed at the near point by the unaided eye, the visual angle is, where D is the least distance of distinct visionhttp://www.astarmathsandphysics.com/ib_physics_notes/optics/ib_physics_notes_the_angular_magnification_of_a_magnifying_glass_when_the_image_is_formed_at_the_near_point_html_m367c081d.gif Now the object is placed at distance u from the lens, the visual angle subtended by its image is given by http://www.astarmathsandphysics.com/ib_physics_notes/optics/ib_physics_notes_the_angular_magnification_of_a_magnifying_glass_when_the_image_is_formed_at_the_near_point_html_f9ca6a7.gif The angular magnification is, therefore, given by 4.4.3 Compound Microscope Compound Microscope is a kind of optical instrument that uses visible light and a lens system to magnify images of small samples. C:UsersGaryDesktopcompound micropound.png The lens L1 nearer to the object, called the objective, forms a real, magnified, inverted image I1 of an object O placed just outside its principal focus Fo. I1 is just inside the principal focus Fo of the second lens L2, called the eyepiece, which act as a magnifying glass and produces a magnified, virtual image I2 of I1. In normal adjustment, the final image I2 lies at the near point. Then the visual angle subtended by the final image to the eye is given by When the object of height h is placed at the near point and viewed unaided, the visual angle subtended by the object is given by Hence, the angular magnification is given by And since, the linear magnification is equal to the linear magnification of the objective x linear magnification of the eyepiece. (Giordano, 2011) 4.4.4 Refracting Astronomical Telescope Refracting Astronomical Telescope consists of two converging lenses; one is an objective with long focal length and the other an eyepiece with short focal length. The objective L1 forms a real, diminished, inverted image I1, of a distant object at its principal focus Fo since the rays incident on L1 from a point on such an object can be assumed parallel. The eyepiece L2 acts as a magnifying glass and forms a magnified, virtual image of I1 and, when the telescope is in normal adjustment, this image is at infinity. I1 must, therefore, be at the principal focus F2 of L2, hence F0 and F2 coincide. http://images.tutorvista.com/content/optics/astronomical-telescope-magnifying-power.jpeg From the above figure, we find that The visual angle subtended by the object is given by and the visual angle subtended by the object is given by, where h is the image height. Therefore, the angular magnification is For telescope in normal adjustment, the separation of the two lenses is the sum of the focal lengths. And this, the foci of the objective lens and the eye-piece must be at the same place. (Giordano, 2011) 4.4.5 Galilean Telescopehttp://www.transtutors.com/userfiles/image/ARUN/IMAGES/Gal.JPG Galilean Telescope consists of two lenses a converging objective of large focal length and a diverging eyepiece of small focal length The angular magnification is 5. Conclusion In this term paper, the concepts of geometric optics are included comprehensively such as law of reflection, refraction, formation of images in mirrors and lens, etc. The notion of a light ray and the scientific study of light are involved in a bid to illustrating the working principle of different mirror and optical instruments, such as various telescope, efficiently.

Reparations to Descendants of Slaves Should Have Ceased Long Ago Essay

Reparations to Descendants of Slaves Should Have Ceased Long Ago In this day and time the world is heavily concerned with political and social corrective ness, thus everyone is catered too and no money changes hands. The idea and arguments of paying reparations to the descendants of slaves has been in the American media and courthouses since the English barrister James Grahame published a groundbreaking book in 1850 setting the first claim for reparations in the United States. It is no surprise that these allegations arose so soon after the abolishing of slavery at the culmination of the Civil War. Free blacks and enslaved blacks are accredited with building a nation on their backs, that is not so; America was built on the backs of the heroic men who served in the American Revolution and the victorious soldiers who reconciled a broken country after the Civil War. Reparations cannot be paid to those whom it is not owed. America has been heavily criticized for quietly supporting slavery in the North and celebrating the institution of slavery in the South. It seems quite puzzling as to why reparations are so sought after by African Americans in the country, when none of them are direct descendants of those who were enslaved. African Americans have been so bold to even bring forth allegations against nations in Europe for starting and profiting from the slave trade as well as the colonization of Africa, it we as a civilized people did our homework we would find that it was capitalistic tribes of Africa who staged the capturing of the slaves thus setting the wheels of slavery in motion. This is the main reason why America can not and will not be charged with the heinous act of paying billions of tax dollars to non-existent sl... ...just settlement of emotional, physical, mental, or financial debt. As John Carroll fervently proclaims â€Å"I didn’t do it! My ancestors didn’t do it! The people who did it are dead now.† Slavery is a worldwide epidemic, it has been passed down through time, so Judge Halbert I declare that you vehemently clear America, the West, the nations of Eastern Europe, and Christians clear of any wrongdoing in saving the slaves from a life of darkness and sin. WE HAVE PAID OUT DEBT’S IN FULL! Works Cited Page Brooks, Raymond L. â€Å"Paying for Past Sins†: Taking Sides. 16 June 2002.

Black Rage-Book Report Essay

The pages of human history daubed in bloodshed and thickly coated with ethnic, racial conflicts ask a crying question. How to make this Planet Earth heaven -like? The answer is simple and direct. Eyes full of understanding, heart full of love and the life that refuses conflicts—these alone are enough! When an individual or a people of a particular race are constantly nagged and abused, condemned and ostracized by the society, they become bitter and cynical individuals. Heartfelt care and concern, an understanding approach and tender regard for their feelings are necessary pre-requisites to heal their inner wounds. Adequate opportunities need to be created for their ‘reformation’ and ‘rehabilitation’ into the mainstream of the society. The authors feel that it is not an easy task. Each and every molecule of the Negro race is surcharged with the hidden grudge as for the inhuman treatment meted out to them in all walks of life, from the cradle to the grave and from the womb to the tomb and this process continued for centuries. They were branded from birth as ‘niggers. ’ This insult on their personality is difficult to condone. Brief summary of the book: This is a classic work on black identity. This is also criticized as one of the sexiest books. Slavery is no ordinary crime against humanity. The book explains the race relations and its dynamics in the day to day living of the blacks vs. whites. How at each step of the ladder the blacks were pulled down, how they were made to stumble at deliberately created hurdles by the whites, how slavery dynamics deeply impact the cross-racial sexual relationships etc. It is one thing to have freedom and protection for the essential human dignity of the individual legally. It is good to have uniform constitutional rights for whites and blacks. But what mattes is the interpretation of the laws and their applicability to the ground level situations, concerning the blacks. The book is an authentic source of inspiration to the educated younger generation of blacks, and for the African psychologists of the day. The book cites case studies and they are properly dealt with. The point by point analysis of the â€Å"intra-psychic† dynamics of Black life in every day America is extremely informative and an eye-opener. Blacks, in many parts of the world where the whites were the dominating community, suffered, and in USA they suffered intensely. The authors are psychiatrists by profession and they are eminently suited to treat this subject. The inner conflicts and the desperation of back life, how they carry on with their back to the wall existence—all these have been highlighted, with the zeal of pursuing the truth. As the black race is exposed to various social situations related to the individual growth through education, employment, achievement of status in life, the intra-racial problems have begun to crop up with great intensity. The authors cite the case of an educated school teacher, marrying a laborer. They explain: â€Å"†¦She was embarrassed by his poor education. He felt that she and her friends were â€Å"phony† and that she was preoccupied with maintaining senseless appearances. Their mutual hostility led to verbal and later physical assaults. Divorce was the result. This pattern is so common in Negro marriages that it deserves special study, which might shed light on the broader problems of how in America choice of mate and marriage in general is influenced by a person’s blackness. †(p. 75) The authors put forth strong arguments that black people living in a racist, white dominated society have suffered and are suffering psychological pressure by the effects of racist oppression. This sometimes, has the telling effect in on the day to day disposition and black people act in unpredictable manner. The thesis of the book: Will the country ever awake in to that heaven of freedom, and when it will be free from the division of narrow domestic walls created by race prejudices? What you do to mitigate the mental barrier of racial discrimination on so many counts is not important. How you do, what you do is indeed important. More acts and legislations have helped to create a stir in the minds of whites and blacks. But the problem eludes permanent solution. This is so, because the feeling of superiority within the minds of the whites has to change. When the thought process will change, the action process will also change! When the thoughts are changed, the mind is changed; when the mind is changed, the man is changed; when the man is changed, the society is changed; when the society is changed, the Nation is changed. Then only we can way that plenty and prosperity engulfs USA, not otherwise! The contents and arguments in the book contain too much sex, much more than required by the literary standards. But some times, these issues are beyond the control of the authors. Firstly the book must sell. This is the prime objective of the publisher. Fortunately or unfortunately, sex sells. If it is handled well, it sells well. This could be one of the reasons for the extra dose of sex in the book—this may not be as well! This book has about 230 pages with 10 chapters, Who’s angry, the shadow of the past, achieving womanhood, acquiring manhood, marriage and love, character traits, the â€Å"Promise† of education, mental illness and treatment, and how come there’s so much hate and black rage. In a nutshell, the contents of the book discuss and analyze the bitter past of slavery in USA, the tension-ridden race relations in USA today, and the future of black and white race relations which have the possibilities to turn worst, on the slightest provocation, when the black race is making its presence felt strongly, in political, social, and economic spheres. In sports, blacks are dominating! The blacks accepted the domination of the white race-will the whites accept the domination of the black race in times to come? Will the law of divine retribution work in this context? Identify the evidence used by the author to support his/ her thesis That which is evident requires no introduction, elaboration, or appreciation. Light is bright and it is evident. Milk is white and it is evident. Simply say black race in America, and everything is evident. The saga of suffering of the Negro race, the era of slavery, violence and cruelty to subdue their legitimate aspirations rotates on the curtain of one’s mind. The authors of Black Rage do not mince words when it comes to condemning the atrocities committed on the black race. â€Å"The voice of black America has been heard in the explosions of Watts, Newark, and Detroit,† they warn. (p. 3) They assert their aspiration in strongest terms. â€Å"Black people continue to revolt against laws and customs that are deadly and humiliating†¦Aggression leaps from wounds inflicted and ambitions spiked. It grows out of oppression and capricious cruelty. †(p. 3). The younger generation of Negroes is not willing to wait and accept ‘the tactful handling of the situation’ by the whites when their interests matter. The white race is not willing to travel in the boat where the rudder is controlled by the black. The blacks are aware, by their bitter past experiences that the whites will go to any extent when their own interests matter. This causes more frustration and apprehension in the black community and adversely affects their psyche. The example cited in the text is that of Jimmy, a twelve year old boy. â€Å"His face was jet-black, and his expressions ranged from somber to sad. Whether relating stories of home, school, or the streets, he disguised his true feelings. At twelve he had learned one of his first lessons–always play it cool. As much as possible, he worked to hide his inner life. One day he stared long and hard at his fist and said: â€Å"I want to hit a white man. †(p. 59) State your own opinion and ideas about this book. The book contains tough opinions about the white race. To tell a black youngster to forget the past, say that he is constitutionally protected and enjoys equal rights as applicable to whites or any ethnic group is as good as telling him a story. The suffering of the Negro race is something very special and closely linked to the destiny of America. The black can condone the past; they can not ignore or forget it. The whites are not obliging the blacks by the present stance of understanding them. They have no other alternative. They must accept their newfound social position—equal in every respect as compared to the black people and it is their duty to say that the black-brother is first among the equal. They must attempt and secure the transformation within. The writers put it crisply and authoritatively. â€Å"After all, the thoughts begin, the Negro is also an American and if he is different it is only matter of degree. Cliches are brought forth and there is a lengthy recitation of the names of famous Negroes. Long association has bred feelings of familiarity which masquerade as knowledge. But there remain puzzles about black people; all is not understood; something is missing. †(p. 23) â€Å"It is better to have a world united than a world divided; but it is better to have a world divided, than a world destroyed,† said Sir Winston Churchill at the time of II World War. Presently, does this quote apply to the solution for the race problem in USA? USA will never be divided in geographical terms, the Constitution of USA is strong enough, the political leaders have enough foresight, but the example given in the book is shocking and is the definite pointer, how the division of the hearts is complete. How Come There’s So Much Hate? â€Å"When the man died, his wife of forty years was pitied by her friends. The widow was a stern New Englander; her dead husband was a black. In spite of strong social disapproval of their marriage, they had raised children and prospered. There had been some discord between them, but they handled it discreetly and the children had never heard them comment on racial matters. Even when a racial incident was prominent in the news, not a word was said about it. The children assumed that their mother had long since accepted the realities of marriage to a black man. They were completely unprepared for her words when her husband died: â€Å"Thank God that nigger is gone! â€Å"(p. 181) Spirituality, not religion, seems to be the only answer to this vexed problem of race relations. Once a human being crosses the mind barrier, all differences all tensions, cease! Mind is a bundle of negative and positive thoughts. The usual methods of suppressing the thoughts and emotions are not going to bring permanent peace. If the Negro race has to surrender at any point, it has got to be the dynamic surrender, of a supreme and brave human being. They should not accept the supremacy of the white race, nor demand the pound of flesh for the historical misdeeds of the whites. If the revengeful attitude persists, it will take them and the Nation nowhere. If the Nation does not survive how will the black and white races survive?

A Behavioural Based Study on Lifting and Hoisting Failures - Free Essay Example

Sample details Pages: 5 Words: 1631 Downloads: 2 Date added: 2019/10/10 Category Statistics Essay Type Research paper Did you like this example? Lifting and Hoisting Failures Introduction Lifting and hoisting related injuries have been on the rise. Even with all the technological advancements, legislations, best practices and standards; incidents still occur. By definition, safety professionals are responsible for controlling exposure to risk (Tim Page-Bottorff, February 2016). Don’t waste time! Our writers will create an original "A Behavioural Based Study on Lifting and Hoisting Failures" essay for you Create order In many ways, I do agree with that statement. For SHE practitioners, a hierarchy of controls establishes the actions to be considered in an order of effectiveness to resolve unacceptable hazardous situations (Fred A. Manuele, May 2005). For my research topic, I focused on human behavioral aspects of lift related activities. There are a myriad of lift related articles but most focus on engineering aspects. Some, do come close like in the case of a defect in the design of the crane, it was classified as a `normal accident’ (Paul Swuste, 2013). But herein, it emphasizes on the defects which led to an accident with an element of risk tolerance. Human factors are studied independently and form a holistic approach for safety management but not necessarily how it correlates to lift operations. Very often, little attempt is made to understand why the human failures occurred (Health and Safety Executive, 1999). Research Question How can we embed behavior-based safety into lifting and hoisting operations to reduce incidents? Aim and Objectives Aim My aim was to highlight human errors, gaps and lapses that contribute to lifting failures. Examine and assess underlying root causes related to human behavior that cause lifting related incidents. Discover fundamental reasons for recurring fatal and serious injuries. What are the human errors and gaps that cause such incidents and what can we do to overcome them? There was a need to boil down to root causes and introduce causal learning initiatives. `  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   All reasoning was researched without vilipending any detail in the slightest. In doing so, we were able to recommend mechanisms with verification and validation protocols that form a holistic approach to managing lift operations. Inefficiencies in lifting and hoisting cause incidents and consume both tragic human and financial loss at an unacceptable level. Various ways to reduce or eliminate these inefficiencies were identified. Objectives Purpose of study was to expose behavioral faults relating to lifting and hoisting operations. By delving and investigating what drives such acts we can rectify what drives a person to commit an at-risk behavior. By recognizing factors that contribute to poor lift and hoist operations, we can introduce systems and measures to prevent incidents. We have to strike a fine balance so as to ensure that recommendations introduced are not exhaustive and inferential. Eliminating poor lifting and hoisting practices by using behavior-based foundations. The research enabled stakeholders to proactively identify lift related hazards and provide for mitigation recommendations. It may also help establish proper procedures or standards by serving as a tool for analyzing risks associated with lifts. Recommendations or measures introduced also have the potential to be used in other contexts and tasks. In essence, it’s applicable to a myriad of activities but my focus was only be on lift and hois t operations as it’s the focus of my study. After study was conducted, a root cause analysis flowchart was established. Notion being that factors or perceptions which would have led or initiated sequence of events that resulted in and individual or workgroup committing an at-risk behavior. It was therefore be of interest to correct these factors so as to prevent recurrence of a similar situation. In do so, it was imperative to establish correct root causes as this in turn derives necessary measures to rectify situations that could have potentially have led to an at-risk behavior or incident. Potential benefits to lift and hoist operations was identified to be lesser stakeholders being injured, reduction in incident severity and reduction in property damage. In turn, this lead to an increase in efficiency, productivity, reliability and performance. Literature Review Most of the fatalities studied appear to be due carelessness or inattention (J.E. Beavers et al., 2006). What can we do about it? Careless, inattentive; what can we do about it? What if I told you that technology could help you by warning an individual of a potential falling object? Could we track being struck by falling objects based on real time information for proactive prevention (Weiwei Wu et al., 2013)? A bold concept, being struck by falling objects is a proponent of lifting operation related hazards. However, there are numerous hazards in a worksite and being struck by falling objects is just one of it. Albeit proposals recommended in this article is low cost, its application are very limited as it’s not a one-solution that fixes all and recommending such measures to stakeholders may not be well received by decision makers as it only helps with one aspect of managing people. There are other factors that must be taken into consideration such as how these RFID sensors ar e to be maintained. Is there a calibration regime etc.? In light of recent accidents do you there is a need for tighter controls and inspection of cranes? (Begum Sertyesilisik et al., 2013). That is a question that would be asked to an operator or lift specialist. How would he feel? It sounds like the question in itself doubts the competency, skill and knowledge of that individual. But, the writers have acknowledged the need for a feedback mechanism that is not part of a current apparatus. Personnel performed test with no previously established procedures (A.A. Marquez et al., 2014). Errors made by humans are being identified. What is being done about that? By delving into case studies with interviews from persons involved; they’ve come up with evidence based recommendations. However, it is important to note that this study was done within the UK context. As with all, culture forms the foundation of practices. There is one too many articles that tend to focus on material aspects. Instead of narrowing down root causes on why certain decisions made, a stress analysis of a crane jib is first carried out (Fransesco Frendo, 2013) a seam weld caused a dockside crane jib to collapse. Instead of asking why someone chose to seam weld a `structure’, questions were focused on equipment integrity. The vantage points for incidents are being seen from an engineering and quality standpoint with very few considerations about persons. Yes, people do agree that failure of cranes are potentially dangerous events and often have fatal consequences (A.A. Marquez et al., 2014). Root causes are related to human errors and be defined as exceeded barriers (A.A. Marquez et al., 2014). A spade is a spade and let’s refers to it as such. By manipulating human errors we fail to recognize consequences of actions since we’re subverting its notion. Assess the importance of each factor influencing risk (O.N. Aneziris et al., 2014). Evaluating such factors does not provide for an immediate answer. Rather, it denotes important items that should be considered before a corrective and preventive action plan is developed. Accident rates can be reduced through usage of safety devices and by legislation (Begum Sertyesilisik et al., 2013). Are we placing too much faith on engineering and administrative controls? Hierarchy of controls establishes the actions to be considered in an order of effectiveness to resolve unacceptable hazardous situations (Fred A. Manuele, May 2005). Hazardous situations could be resolved with control measures but human behavior is unpredictable. Undoubtedly, it’s human behaviors that either cause or contribute to hazardous situations. No matter how rigorous the safety system, human behavior could short-circuit almost any safety feature (Tim Page-Bottorff, February 2016). Influencing positive behaviors that reduces errors (Health and Safety Executive, 1999). Careful consideration of human factors at work can reduce the number of incidents (Health and Safety Executive, 1999). By using this concept as a catalyst, we can reduce incidents to lift operations. The challenge lies in applying it proactively with minimal impact to operations. Relatively little focus is placed on properly adjusting the wide range of potentially unsafe habits that workers bring with them to the work-place each day (Tim Page-Bottorff, February 2016). Overhauling the present concept of corrective and preventive action plan is imperative. The clichà © action plans routinely tell persons to be retrained or be suspended from work. Does that solve the problem? The research I’m doing will delve into this narrative. Study Design As said in my research question, I’d like to embed behavior based safety into lift operations so as to reduce incidents in this field. For my method of study, I’ll initiate case studies from 3 different lift operations. In each lift operation, there is a Lifting Supervisor, Rigger, Signalman and Crane Operator. Each team compromises of a 4-men crew. This will be all be done in the context of my workplace which is in the oil gas industry. Each lifting team will differ in setting, meaning, I’ll be conducting case studies from Maintenance, Projects and Turnaround. Each department’s tasks  Ã‚   would differ in job scope, objective and priorities. Each study will involve interviewing members of each lifting team and observing their behaviors pertaining to lift operations. In addition, I’ll also interview a front line supervisor from each work party. These front line supervisors are act as work coordinators or planning engineers to ensure work is done as per scope and are responsible for all overall work aspects. In summary, I’ll be conducting interviews on 15 persons. Even though stakeholders work within the organization, each departments has different methods of work. It’ll interesting to note how each department thinks and sets its own precedence. Albeit organizational culture sets the tone, this rarely trickles down to departments. Timelines, scheduling, budgets, perception, Key-Performance Indicators / Lagging indicators etc. mandate practices on the field. I’ll attempt to investigate the differences in opinions and what can be done to align practices for the greater good.