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

Options

A. `20^(@)` 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

Answer

A

Explanation

For mimimum deviation
`i=e` and `r_(1)=r_(2)=A//2=30^(@)`
which is independent of nature of light.
Both the lights are set for minimum deviation so angle of
refraction will be `30^(@)` for both colours.