Question 415: Ray Optics

Question

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 :

Accepted Answer

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, $r=30^\circ$.

Answer

30$^\circ$ for both the colours

Answer

greater for the violet colour

Answer

greater for the red colour

Answer

equal but not 30$^\circ$ for both the colours

Ray Optics

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 :

Choose the correct answer: