Physicshard · Past Paper
Light enters from air into water (n=1.33). What is the critical angle for the water-air interface?
A42 degrees
B48.8 degrees
C90 degrees
D30 degrees
✓ Correct Answer: B — 48.8 degrees
sin C = 1/n = 1/1.33 ≈ 0.75. C = arcsin(0.75) ≈ 48.8 degrees.
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