Question

give to uses of concave mirror and short note on dispersion of light

Answer 1

a mirror in which the hollow inner surface functions as a reflecting surface is called a concave mirror concave mirror is a small part of a hollow sphere of Glass its inside hollow surface is made shining by painting the outer surface first with Mercury and then with lead oxide red lead does the inner surface becomes the reflecting surface

Answer 2

concave mirror is used as beauty mirror
concave mirror is used as shaving mirror

dispersion of light is defined as the splitting of white light into it's constituent colour.