alleryNormal entry into a 30° prism in air, n=1.5. At its next face, sin emergence is
A0.5
B0.75
C1/3
D1.0
Answer & Solution
Correct answer: B. 0.75
Normal entry gives r1=0 and r2=30°, so Snell's law at exit gives sin e=1.5 sin30°=0.75.
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