An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and 2 √ 3 (medium)…

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