A ray undergoes a minimum deviation at 40° when it is incident on equilateral triangular...
PHYSICS
WAEC 2011
A ray undergoes a minimum deviation at 40° when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism
- A. 1.48
- B. 1.50
- C. 1.53
- D. 1.67
Correct Answer: C. 1.53
Explanation
n = \(\frac{\sin \frac{1}{2} (dm + A)}{\sin \frac{1}{2} A}\)
= \(\frac{\sin \frac{1}{2} (40 + 60)}{\sin \frac{1}{2} \times 60}\)
= 1.532
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