A monochromatic light is incident on an equilateral prism at an angle 30^o and is emergent at an angle of 75^o . What is the angle of deviation produced by the prism?

Light ray falls at normal incidence on the first face and emerges gracing the second face for an equilateral prism.
(a) What is the angle of deviation produced?
(b) What is the refractive index of the material of the prism?

The angle of minimum deviation for an equilateral prism is 37^o . Find the refractive index of the material of the prism.

Find the dispersive power of a prism if the refractive indices of flint glass for red, green and violet colours are 1.613, 1.620 and 1.632 respectively.

The wavelength of light from sodium source in vacuum is 5893Å. What are its
(a) wavelength,
(b) speed and
(c) frequency when this light travels in water which has a refractive index of 1.33.