Two beams of red and violet colours 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

Options

A. `30^(@)` for both the colours
B. greater for the violet colour
C. greater for the violet colour
D. equal but not `30^(@)` for both the colours

Answer

B, C

Explanation

For any prism , `r_(1) = r_(2) = A`
In the position of minimum deviation for any wavelenght,
`r_(1) = r_(2) = (A)/(2) = (60^(@))/(2) = 30^(@)`