Question: Light enters a solid tube made of plastic having an index of refraction of 1.65. The light travels parallel to the upper part of

Light enters a solid tube made of plastic having an index of 

Light enters a solid tube made of plastic having an index of refraction of 1.65. The light travels parallel to the upper part of the tube. You want to cut the face XY so that all the light will reflect into the tube after it strikes it. How big can angle 0 get before the light escapes into the air? A. 36.8 B. 53.2 C. 59.5 D. 89.4 E. 79.1 F. 23.5

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