Light pipe. Light enters a solid tube made of plastic having an index of refraction of 1.60. The light travels parallel to the upper part of the tube (See Figure 23.55.) You want to cut the face AB so that all the light will reflect back into the tube after it first strikes that face (a) What is the largest that θ can be if the tube is in air? (b) If the tube is immersed in water of refractive index 1.33, what is the largest that θ can be?
Figure 23.55
Problem 46.
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