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Light passes from air to glass ($n = 1.5$). Brewster's angle is:
A$30^\circ$, half the right angle on the boundary
B$45^\circ$, the diagonal angle for any clear glass
C$56.3^\circ$, since $\tan\theta_B = n = 1.5$
D$60^\circ$, twice the standard small angle here
Answer & Solution
Correct answer: C. $56.3^\circ$, since $\tan\theta_B = n = 1.5$
$\tan\theta_B = 1.5$, $\theta_B = \tan^{-1}(1.5) \approx 56.3^\circ$.
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