Define dispersion of light. How is scattering of light different from dispersion

Question

(i) Define dispersion of light. How is scattering of light different from dispersion ? Give one example of natural phenomenon based on each of these.
(ii) A beam of light consisting of red, blue and yellow is incident of the prisms as shown below. Complete the diagram to show refracted and emergent ray.

Answer 1

(i) Breaking up of the component colours of light is called dispersion. Dispersion is caused due to difference in velocity of each colour through a medium. Scattering of light takes place due to interaction of light and particles suspended in a medium. Rainbow is an example of dispersion. Blue colour of sky, red colour of sky at sunrise or sunset is example of scattering of light.

(ii)