Answer to Question #193481 in Optics for Harry

Question

1.  If a glass converging lens is placed in water, its focal length in water will be (a) longer, (b) shorter, or (c) the same as in air. Explain.

2.    A flashlight beam strikes the surface of a pane of glass (n = 1.56) at a 67° angle to the normal. What is the angle of refraction?

Answer 1

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