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

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