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Question

A ray of light travelling inside a rectangular glass block of refractive index 2 is incident on the glass-air surface at an angle of incidence of 45. Show that the ray will emerge into the air at an angle of refraction equal to 90.

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Solution

Given, C=45
sinC=1μ=12=sin45
So, the ray will graze the interface after refraction at an angle of 90

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