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White light is incident on one of the re...

White light is incident on one of the refracting surfaces of a prism of angle `50^(@)`. If the refractive indices for red and blue colours are 1.641 and 1.659 respectively. The angular separation between these two colours when they emerge out of the prism is

A

`0.9^(@)`

B

`0.09^(@)`

C

`1.8^(@)`

D

`1.2^(@)`

Text Solution

Verified by Experts

Angular dispersion.
`delta_(B) - delta_(R) = (mu_(B) - mu_(R))A`
=`(1.659 - 1.641) xx 5^(@) = 0.09^(@)`.
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