Q. When the angle of incidence on a material is $60{^\circ}$, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in $ms^{- 1}$)
A) $3 \times 10^{8}$
B) $\left( \frac{3}{\sqrt{2}} \right) \times 10^{8}$
C) $\sqrt{3} \times 10^{8}$
D) $0.5 \times 10^{8}$
Explanation
(c) From Brewster’s law $\mu = \tan{i_{p} \Rightarrow \frac{c}{v} = \tan{60{^\circ} = \sqrt{3}}}$
$\Rightarrow v = \frac{c}{\sqrt{3}} = \frac{3 \times 10^{8}}{\sqrt{3}} = \sqrt{3} \times 10^{8}m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.