ch33-p075 - 75. Let be the angle of incidence and 2 be the...

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75. Let θ be the angle of incidence and 2 be the angle of refraction at the left face of the plate. Let n be the index of refraction of the glass. Then, the law of refraction yields sin = n sin 2 . The angle of incidence at the right face is also 2 . If 3 is the angle of emergence there, then n sin 2 = sin 3 . Thus sin 3 = sin and 3 = . The emerging ray is parallel to the incident ray. We wish to derive an expression for x in terms of . If D is the length of the ray in the glass, then D cos 2 = t and D = t /cos 2 . The angle α in the diagram equals 2 and x = D
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