JEE Advance - Physics (2008 - Paper 1 Offline - No. 4)
Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60$$^\circ$$). In the position of minimum deviation, the angle of refraction will be :
30$$^\circ$$ for both the colours
greater for the violet colour
greater for the red colour
equal but not 30$$^\circ$$ for both the colours
Paskaidrojums
For minimum deviation, the ray in the prism is parallel to base of the prism. This condition does not depend on the colour (i.e., wavelength of incident radiation. So, both the cases, by geometry, $$r=30^\circ$$.