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Refraction — Easy JEE physics MCQ

Light travels from a medium with refractive index 1.5 to air. The critical angle for total internal reflection is:
  1. A. 30°
  2. B. 41.8°
  3. C. 45°
  4. D. 60°

Solution

At critical angle, sin C = 1/μ = 1/1.5 = 2/3. Thus C = sin⁻¹(2/3) ≈ 41.8°.

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Light travels from a medium with refractive index 1.5 to air. The critical angle for total internal reflection is:
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Refraction — Easy JEE Physics MCQ | MyGoalPrep