**Brewster's angle** $\theta_B$ is the angle of incidence at which:
ANo light reflects
BAll light refracts perpendicular to the surface
CReflected light is completely plane-polarized (perpendicular to plane of incidence)
DTotal internal reflection occurs
Answer & Solution
Correct answer: C. Reflected light is completely plane-polarized (perpendicular to plane of incidence)
At Brewster's angle the reflected and refracted rays are perpendicular; the reflected beam contains only the electric-field component perpendicular to the plane of incidence — i.e. is fully polarized. $\tan\theta_B = n_2/n_1$.
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