JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Wave Optics

When unpolarized light is incident at an angle of

6 0^{\circ}

on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

(A) $3 0^{0}$ ✓ Correct
(B) $6 0^{0}$
(C) $9 0^{\circ}$
(D) $4 5^{0}$

Answer: (A)

Solution

At the polarizing angle, the reflected and refracted rays are mutually perpendicular — this is Brewster's condition. If

i_{B}

is the angle of incidence at which the reflected light is fully polarized, then

i_{B} + r = 9 0^{\circ}

Here

i_{B} = 6 0^{\circ}

, so

r = 9 0^{\circ} - 6 0^{\circ} = 3 0^{\circ}

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Single correct option

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