Light passes from air (n=1) into glass (n=1.5) at an incidence angle of 60°. Using Snell's law, the angle of refraction is
A{'text': 'sin⁻¹(√3 / 3)', 'label': 'A'}
B{'text': 'sin⁻¹(√3 / 2)', 'label': 'B'}
C{'text': 'sin⁻¹(2/3)', 'label': 'C'}
D{'text': '30°', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'sin⁻¹(√3 / 3)', 'label': 'A'}
1. Snell: n₁ sin θ₁ = n₂ sin θ₂ ⇒ 1 × sin 60° = 1.5 × sin θ₂.
2. sin θ₂ = (√3/2) / 1.5 = √3/3.
3. θ₂ = sin⁻¹(√3/3) ≈ 33.6°.
_Source: NCERT Class 12 Physics Part II, Ch 9 §9.3_
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