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. `30^(@)` for both the colors
B. greater for the violet color
C. grater for the red color
D. equal but not `30^(@)` for both the colors

Answer

a.

Explanation

At minimum deviation `(delta-delta_(m)):`
`r_(1)=r_(2)=(A)/(2)=(60^(@))/(2)=30` (for both colors)
`:.` Correct answer is (a).