We use flint glass prism to disperse polychromatic light because light of different colours

White light while passing through a glass prism breaks up
into light of different colocurs because

A prism splits a beam of white light into its constituent colours. This is so because ____ of different colours is different.

Assertion : A priam is the source of colours of light.
Reason : A prism has same refractive index for different colours of light.

In a direct vision sperctroscope there are four crown glass prisms of angle $5^{\circ }$ each and three flint glass prisms. The dispersive powers of crown and flint glass are 0.03 and 0.05, repectively and their refractivities ar 0.518 and 0.655. Calculate the dispersion produced and the angle of the flint glass prisms required for no deviation.

(a) The refractive index of glass is 1.5. What is the speed of light in glass?
(b) Is the speed of light in glass independent of the colour of light ? If not, which of the two colours red and violet travels slower in a glass prism?

The dispersive powers of flint glass and crown glass are 0.053 and 0.034 respectively and their mean refractive indices are 1.68 and 1.53 for white light .Calculate the angle of the flint glass prism required to form an achromatic combination with a crown glass prism of refracting anlge $4^{\circ }$ .

Assertion: Speed of light in glass is indep[endent of the colour of light.
Reason : the violet colour travels faster than the red light in a glass prism.

Red light cannot be dispersed by a glass prism because it :

In dispersion of white light through glass prism, it is observed that violet colour bends more and red colour bends less, then

Calculate the dispersion and deviation ( mean) produced by a flint glass prism placed in the position of minimum deviation with respect to the mean colour. The angle of prism is ${60}^{\circ }$. Also calculate the dispersive power of the prism. Index of refraction of flint glass for blue light=0.667 and that for the red light =1.643.