In a prism, the refractive indices of different colours are μV= 1.6; μR= 1.52; μY= 1.56. The dispersive power of the prism is :

156

18

17

Infinite

A

156

B

17

C

18

D

Infinite

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Solution

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Dispersive power of prism= w=μV−μRμY−1

w=1.6−1.521.56−1

w=17

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