First slide

Prism

Question

A ray of monochromatic light suffers minimum deviation of 38° while passing through a prism of refracting angle 60°. Refractive index of the prism material is $(take \sin 49^{\circ} = 0 .7547)$

Moderate

A

1.5
B

1.3
C

0.8
D

2.4

Solution

$μ = \frac{\sin \frac{A + δ_{m}}{2}}{\sin \frac{A}{2}} = \frac{\sin \frac{60 + 38}{2}}{\sin \frac{60}{2}} = \frac{\sin 49^{\circ}}{\sin 30^{\circ}} = \frac{0 .7547}{0 .5} = 1 .5$

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