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

Options

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

Answer

D

Explanation

Here, angle of prism, `A=60^(@)`
For minimum deviation,
Angle deviation, `r=(A)/(2)=(60^(@))/(2)=30^(@)` for both the colours.