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  4. On a glass plate a light wave is incident at an angle of 60° . If the reflected and refracted waves are mutually perpendicular, the refractive index of material is :

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Q. On a glass plate a light wave is incident at an angle of $ 60^{\circ} $ . If the reflected and refracted waves are mutually perpendicular, the refractive index of material is :Physics Question Image

Haryana PMTHaryana PMT 2001

Solution:

By Brewsters law, $\mu=\tan i_{p} \mu=\tan 60^{\circ}=\sqrt{3}$