When the angle of incidence from air on a material is 60°, the reflected light is completely polarized. Find the speed of the refracted light inside the material.
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Question

When the angle of incidence from air on a material is 60°, the reflected light is completely polarized. Find the speed of the refracted light inside the material.

G1 Physics · Accepted Answer

Complete polarization of the reflected ray means the incidence angle is Brewster's angle. Thus n=tan60°=√3. The speed in the material is v=c/n=(3×10⁸)/√3=√3×10⁸ m s⁻¹. Option C.