WAEC Physics 2012 Objective — Question 26
Question 26 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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A ray undergoes a minimum deviation of 40° when it is incident on an equilateral triangular glass prism. Calculate the refractive index of the prism.
- A. A. 1.48
- B. B. 1.50
- C. C. 1.53Correct
- D. D. 1.67
Explanation
Using n = sin[(A+Dm)/2] / sin(A/2) = sin(50°)/sin(30°) = 0.766/0.5 = 1.53.
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