• # question_answer When the angle at incidence on a material is ${{60}^{o}},$the reflected light is complete polarized. The velocity of the refracted ray inside the material is (in m/s) A)  $3\times {{10}^{8}}$                    B)  $\left( \frac{3}{\sqrt{2}} \right)\times {{10}^{8}}$C)  $\sqrt{3}\times {{10}^{8}}$                     D)  $0.5\times {{10}^{8}}$

From Brewster's law, $\mu =\tan \,ip$ $\frac{C}{V}=\tan {{60}^{o}}=\sqrt{3}$ $V=\frac{C}{\sqrt{3}}=\frac{3\times {{10}^{8}}}{\sqrt{3}}=\sqrt{3}\times {{10}^{8}}m/s$