An unpolarised light is incident at an interface of two dielectric media having refractive indices o

Question

An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and $2 \sqrt{3}$ (medium) respectively. To satisfy the condition that reflected and refracted rays are perpendicular to each other, the angle of incidence is $\_\_\_\_$ .

Professor PC Thomas Classes · Answer

According to Brewster's Law, when the reflected and refracted rays are mutually perpendicular, the angle of incidence is the polarizing angle (Brewster's angle), given by $	an 	heta_p = \frac{\mu_2}{\mu_1}$, where $\mu_2$ is the refractive index of the refracting medium and $\mu_1$ is that of the incident medium. Here, $	an 	heta_p = \frac{2\sqrt{3}}{2} = \sqrt{3}$. This implies $	heta_p = 60^\circ$.