Question

Unpolarized light is incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted rays are perpendicular to each other? (Given $n=1.5$)

Answer 1

Given- $n=1.5$

The reflected and refracted rays will be perpendicular to each other when the ray of light is incident at polarising angle $p$.

By Brewster's law ,

$\tan p=n$

or $\tan p=1.5$

or $p={57}^o$