Physicsmedium · Past Paper
A ray of light is incident on a glass slab. If the angle of incidence is 45 degrees and the angle of refraction is 30 degrees, what is the refractive index?
A1.5
B1.414
C1.732
D1.25
✓ Correct Answer: B — 1.414
n = sin(45)/sin(30) = (1/sqrt(2)) / (1/2) = 2/sqrt(2) = sqrt(2) ≈ 1.414.
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