Question

What is atmospheric refraction use this phenomena to explain the following natural events
1) twinkling of stars with the help of diagram.

Answer 1

this is due to the fine particles which remains in our atmosphere and also due to distance

Answer 2

The refraction of light caused by the earths atmosphere ( having air layers of varying optical density) is called atmospheric refraction.

1) changing atmosphere refracts the light from the stars by different ammount at every moment . It makes us see the stara twinkling.

There is no specific diagram for it