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A ray undergoes a minimum deviation at 40o when it is incident on equilateral triangular...

Physics
WAEC 2011
A ray undergoes a minimum deviation at 40o 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
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Correct Answer: Option C
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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