JEE Main 2026 — Jan 24, Shift 1 — Physics solution

JEE Main2026Jan 24, Shift 1Physics

An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and $23$ (medium) respectively. To satisfy the condition that reflected and refracted rays are perpendicular to each other, the angle of incidence is ______.

A
$6 0^{\circ}$
B
$1 0^{\circ}$
C
$3 0^{\circ}$
D
$4 5^{\circ}$

Solution

The condition that reflected and refracted rays are perpendicular is Brewster's law:

$tan θ_{B} = \frac{n _{2}}{n _{1}} = \frac{2 3}{2} = 3$ .

$\Rightarrow θ_{B} = 6 0^{\circ}$ .

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