A plastic paperweight with an index of refraction n = 1.29 rests on a desk as sh

Question

A plastic paperweight with an index of refraction n = 1.29 rests on a desk as shown in the figure. An incident ray of light enters the horizontal top surface at an angle ? to the vertical. Find the minimum value of ? for which the internal reflection on the vertical surface of the paperweight is total. Assume that the index of refraction of air is 1.

A plastic paperweight with an index of refraction n = 1.29 rests on a desk as shown in the figure. An incident ray of light enters the horizontal top surface at an angle to the vertical. Find the minimum value of for which the internal reflection on the vertical surface of the paperweight is total. Assume that the index of refraction of air is 1 Incorrect. This is the critical angle for total internal reflection. It is not the angle of incidence Number 50.8 at the horizontal surface.

Explanation / Answer

Critical angle = asin(1/1.29) = 50.8

Then Required angle = 90 - 50.8 = 39.2 degree

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