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OPTI 201R 10 L25

# OPTI 201R 10 L25 - 25-1 Chapter 8 Mirrors Reflection...

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OPTI 201R Fall 2010 25-1 Chapter 8— Mirrors Reflection : sin sin i r n I n I ! " (2.14) …therefore r i I I ! " …and n ! -n after a reflection "Why use mirrors? " # To fold the optical system to get extra distance via virtual space. # To correct (change) handedness. # To produce multiple virtual images (kaleidoscopes!!!)

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OPTI 201R Fall 2010 25-2 Image Orientation : Figure 8.1 Point source reflection in the plane of incidence. Figure 8.2 Projection of a line object through a plane mirror. # Plane of incidence \$ %&’ ()*+’ ,-+%*.+.+/ %&’ 0*1 *+2 %&’ +-03*) to the surface. # Raytracing using the Law of Reflection. # A' is a virtual image of A, and B' is a virtual image of B. ( the rays only appear to diverge from the image points.) # The image points are located an equal distance behind the mirror that their respective object points are in front of the mirror. # The line connecting object/image points is ! to the mirror.
OPTI 201R Fall 2010 25-3 Figure 8.3 Observing a line object directly and via a plane mirror. Figure 8.4 Prospective reflection from plane mirror. # “It’s all in your perspective…..”

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OPTI 201R Fall 2010 25-4 Construction of Mirrors: "Scientific-grade" mirrors: # Reflective coating is aluminum (done in a vacuum chamber). (gold in the IR, fresh silver in the UV). # The coating is (usually) on the front surface. "Front-surface" mirrors.
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