An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and 2√(3) (medium) respectively. To satisfy the condition that reflected and refracted rays are perpendicular to each other, the angle of incidence is ______ (a) 45° (b) 60° (c) 10° (d) 30°

Answer: (b). Reflected and refracted rays perpendicular means incidence at Brewster's angle: tan i = (n₂)/(n₁). tan i = (2√(3))/(2) = √(3) So the answer is (b) 60°.

An unpolarised light is incident at an interface of two dielectric… | JEE Main 2026 (24 Jan, Shift 1)

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Refraction, Glass Slab & Apparent Depth

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 ______

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Answer: (b)

Reflected and refracted rays perpendicular means incidence at Brewster's angle: $\tan i = \frac{n_2}{n_1}$ .
$\tan i = \frac{2\sqrt{3}}{2} = \sqrt{3}$
So the answer is (b) $60^\circ$ .

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