Light enters a glass slab (n = 1.5) at angle i = 30°. The angle of refraction r inside glass is approximately:
A30°
B19.5°
C45°
D60°
Answer & Solution
Correct answer: B. 19.5°
Snell: 1 × sin 30° = 1.5 × sin r → sin r = 0.5 / 1.5 = 0.333 → r = arcsin(0.333) ≈ **19.47°**. Light bends toward the normal (denser medium).
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