Refractive index of water is 1.33. Critical angle for water-air interface:
A30°
Bsin⁻¹(1/1.33) ≈ 48.75°
C90°
D60°
Answer & Solution
Correct answer: B. sin⁻¹(1/1.33) ≈ 48.75°
sin θ_c = 1/n = 1/1.33 ≈ 0.752. θ_c ≈ 48.75°. Beyond this, light striking water-air interface from inside undergoes TIR.
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