An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brew

Question

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then

Professor PC Thomas Classes · Answer

(c) : Brewster's angle, $	an 	heta_B=\frac{\mu_2}{\mu_1}$ where $\mu_1$ is the refractive index of air and $\mu_2$ is the refractive index of the given medium, $\mu_2=1.73$. \ $ 	herefore \quad 	heta_B=	an ^{-1}(1.73) \approx 60^{\circ} $ By law of reflection, \ $ i_P=r=60^{\circ} $ When an unpolarised light is incident on a medium of reflective index 1.73 at Brewster's angle, then reflected light is completely polarised.