Light reflected off a plate-glass window (n = 1.5) is found to be completely polarized at angle-of-incidence θ. Find θ.
A) 56.3°
B) 5.7°
C) 21.2°
D) 18.6°
E) 33.7°

Question

Quizplus · Accepted Answer

The angle of incidence at which light is completely polarized upon reflection is known as Brewster's angle. Brewster's angle θ can be calculated using the formula: tan(θ) = n, where n is the refractive index of the medium. For a plate-glass window with n = 1.5, θ = arctan(1.5) ≈ 56.3°.

Light Reflected Off a Plate-Glass Window (N = 1