alleryBrewster's law: at angle of polarization i_B, the relation between i_B and refractive index n is:
Asin i_B = n
Btan i_B = n
Ci_B = 45° always
Dcos i_B = n
Answer & Solution
Correct answer: B. tan i_B = n
**Brewster's angle:** reflected light fully polarized perpendicular to plane of incidence when tan i_B = n.
For glass (n=1.5): i_B ≈ 56.3°.
Reflected and refracted rays perpendicular at this angle.
Used in polarizing optics.
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