Question 165 of 191

When unpolarized light is incident at an angle of $60^{\circ}$ on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

A$30^{\circ}$B$60^{\circ}$C$90^{\circ}$D$45^{\circ}$

Show answer and solution▾

Answer: (A) $30^{\circ}$

By Brewster’s law at complete polarization, refracted ray and reflected ray are perpendicular to each other.
As angle of reflection will be $=60^{\circ}$. Therefore, angle of refraction will be $=180^{\circ}-60^{\circ}-90^{\circ}=30^{\circ}$.