Physicsmedium · Past Paper
A ray of light passes from air into a liquid. The angle of incidence is 45 and angle of refraction is 30. Find refractive index.
A1.414
B1.5
C1.2
D2.0
✓ Correct Answer: A — 1.414
n = sin(45)/sin(30) = (1/sqrt(2)) / (1/2) = 2/sqrt(2) = sqrt(2) ≈ 1.414.
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