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Two beam of red and violet colors are ma...

Two beam of red and violet colors are made to pass separately through a prism (angle of the prism is `60^(@)`). In the position of minimum deviation, the angle of refraction will be

A

`30^(@)` for both the colours

B

greater for the violet colour

C

greater for the red colour

D

equal but not `30^(@)` for both the colours

Text Solution

Verified by Experts

The correct Answer is:
A
When the deviation produced by an equilateral prism of refracting angle A , is minimum , the angle of refraction `r = (A)/(2) = (60^(@))/(2) = 30^(@)`
This is true for lights of all wavelength . However , from the prism formula , we find that the angles of minimum deviations and the refractive indices are different for different colours .
`therefore` The correct option is (a).
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