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

Question

Quizplus · Accepted Answer

The angle of incidence at which light is completely polarized upon reflection is called Brewster's angle, given by $\theta = \tan^{-1}(n)$. For a plate-glass window with $n = 1.5$, $\theta = \tan^{-1}(1.5) \approx 56.3 \degree$.

Light Reflected Off a Plate-Glass Window (N = 1 θ\thetaθ Find θ\thetaθ

Light Reflected Off a Plate-Glass Window (N = 1 $\theta$ Find $\theta$