A ray enters a glass slab at 45°. Glass n = 1.5. Angle of refraction inside glass:
A60°
B45°
C30°
Dsin⁻¹(sin 45°/1.5) ≈ 28.1°
Answer & Solution
Correct answer: D. sin⁻¹(sin 45°/1.5) ≈ 28.1°
Snell: 1 × sin 45° = 1.5 × sin r. sin r = (√2/2)/1.5 ≈ 0.471. r ≈ 28.1°. Ray bends TOWARD normal (denser medium).
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