A light ray is travelling from air to a liquid of refractive index 3 . If the incident beam is rotated at a rate of 3 rad/sec then the angular speed of refracted beam when angle of incidence is 60° is :-
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Question

A light ray is travelling from air to a liquid of refractive index 3 . If the incident beam is rotated at a rate of 3 rad/sec then the angular speed of refracted beam when angle of incidence is 60° is :-

Options

G1 Physics · Accepted Answer

Derived solution: Step 1: Use Snell’s law at each plane interface. For paraxial viewing through a plane surface, apparent depth = real depth × n(observer)/n(object medium). Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 1 rad s⁻¹. Therefore the correct option is C.