WAEC - Physics (2011 - No. 25)
A ray undergoes a minimum deviation at 40o when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism
1.48
1.50
1.53
1.67
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
= \(\frac{\sin \frac{1}{2} (40 + 60)}{\sin \frac{1}{2} \times 60}\)
= 1.532
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