Question

can anybody explain me about light reflection and refraction

Answer 1

Reflection means the reflection or turning away of light in the same medium
Refraction means the bending of light toward or away the normal from one medium to another medium

Answer 2

in this chapter we should learn to draw ray diagrams of lenses and mirrors. refractive index the how rainbow formed why the colour of sky seem to be blue ,scattering, tindal effect etc .

Hope it is helpful