Dispersion of Light

Assertion : Dispersion of light occurs because velocity of light in a material depends upon its colour. Reason : The dispersive power depends only upon the material of the prism, not upon the refracting angle of the prism

Read the following statements carefully (i) The prism behaves same as that of rectangular glass slab. (ii) All the colours have different angles of deviation in case of dispersion through prism. (iii) All the colours travel with the same speed of light in glass. (iv) Dispersion of light is observed in case of rectangular glass slab. Which of the above statement/s is true?

What do you mean by dispersion of light ? What is a spectrum of light? Name the different colours of light in the proper sequence in the spectrum of white light. OR What do you mean by dispersion ? Name the different colours of light in the proper sequence in the spectrum of white light.

Dispersion Of White Light By A Glass Prism

Which of the following diagrams shows correctly the dispersion of white light by a prism ?