Question

At what angle of incidence (in degrees) will the light reflected from water surface $(\mu =1.3)$ be completely polarized?(integers only)

Answer 1

Given, $\mu =1.3=\frac{4}{3}$

According to Brewster's law, the refractive index of a medium is equal to the tangent of polarizing angle ${\theta }_p$

$\tan {\theta }_p=\mu =\frac{4}{3}$

$\Rightarrow \theta ={\tan }^{-1}\left(\frac{4}{3}\right)={53}^{\circ }$

Hence, the angle of incidence must be ${53}^{\circ }$