When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is ____. (tan−1(1.52)=57.7∘, refractive indices of air and glass are 1.00 and 1.52, respectively)
(A)39.6∘
(B)32.3∘✓ Correct
(C)42.6∘
(D)36.3∘
Answer: (B)
Solution
The reflected beam is completely linearly polarized when the light is incident at Brewster's angle, where taniB=μairμglass=1.52, giving iB=57.7∘. At Brewster's angle the reflected and refracted rays are mutually perpendicular, so iB+r=90∘. The angle of refraction is therefore r=90∘−57.7∘=32.3∘.
JEE Main · 2026 · 23 Jan 2026 · Shift 2 · Single correct option
