barcode reader integration with asp net Refraction and Lenses in Objective-C

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18 Refraction and Lenses
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10 Total Internal Reflection If you were to use quartz and crown glass to make an optical fiber, which would you use for the cladding layer Why 11 Angle of Refraction A beam of light passes from water into polyethylene with n 150 If i 575 , what is the angle of refraction in the polyethylene 12 Critical Angle Is there a critical angle for light traveling from glass to water From water to glass 13 Dispersion Why can you see the image of the Sun just above the horizon when the Sun itself has already set 14 Critical Thinking In what direction can you see a rainbow on a rainy late afternoon Explain
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182 Convex and Concave Lenses
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he refraction of light in nature that forms rainbows and red lunar eclipses is beautiful, but refraction also is useful In 1303, French physician Bernard of Gordon wrote of the use of lenses to correct eyesight Around 1610, Galileo used two lenses to make a telescope, with which he discovered the moons of Jupiter Since Galileo s time, lenses have been used in many instruments, such as microscopes and cameras Lenses are probably the most useful of all optical devices
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Describe how real and virtual images are formed by single convex and concave lenses Locate images formed by lenses using ray tracing and equations Explain how chromatic aberration can be reduced
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Types of Lenses
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A lens is a piece of transparent material, such as glass or plastic, that is used to focus light and form an image Each of a lens s two faces might be either curved or flat The lens in Figure 18-9a is called a convex lens because it is thicker at the center than at the edges A convex lens often is called a converging lens because when surrounded by material with a lower index of refraction it refracts parallel light rays so that the rays meet at a point The lens in Figure 18-9b is called a concave lens because it is thinner in the middle than at the edges A concave lens often is called a diverging lens because when surrounded by material with a lower index of refraction rays passing through it spread out When light passes through a lens, refraction occurs at the two lens surfaces Using Snell s law and geometry, you can predict the paths of rays passing through lenses To simplify such problems, assume that all refraction occurs on a plane, called the principal plane, that passes through the center of the lens This approximation, called the thin lens model, applies to all the lenses that you will learn about in this chapter section Lens equations The problems that you will solve involve spherical thin lenses, lenses that have faces with the same curvature as a sphere Based on the thin lens model, as well as the other simplifications used in solving problems for spherical mirrors, equations have been developed that look exactly like the equations for spherical mirrors The thin lens equation relates the focal length of a spherical thin lens to the object position and the image position Thin Lens Equation
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Vocabulary
lens convex lens concave lens thin lens equation chromatic aberration achromatic lens
The inverse of the focal length of a spherical lens is equal to the sum of the inverses of the image position and the object position
The magnification equation for spherical mirrors used in 17 also can be used for spherical thin lenses It is used to determine the height and orientation of the image formed by a spherical thin lens Magnification m
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The magnification of an object by a spherical lens, defined as the image height divided by the object height, is equal to the negative of the image position divided by the object position
Figure 18-9 A convex lens causes rays of light to converge (a) A concave lens causes rays of light to diverge (b)
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