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A ray undergoes a minimum deviation at 40o when... - WAEC Physics 2011 Question

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 Option: C

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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