WAEC Physics 2013 Objective — Question 28
Question 28 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface.
- A. 19.0°
- B. 21.0°
- C. 39.0°
- D. 42.0°Correct
Explanation
sinC = 1/n = 1/1.5 = 0.67. C = sin⁻¹0.67 = 42°.
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