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Question of the day: 2026-10-20

JAMB UTME Physics 2012

Light passes from glass of refractive index 1.5 into air. What is the sine of the critical angle?
  1. 1.5
  2. 2/3
  3. 1/3
  4. 0.5
Show the answer and explanation

Answer: B. 2/3

At the critical angle, sin c = n_air/n_glass = 1/1.5 = 2/3.

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