What do you mean by atmospheric refraction? Mention some of the natural phenomenon which occur due to atmospheric refraction.
The density of earth’s atmosphere is not uniform throughout its width. It behaves as an optical medium with different layers of varying densities. When light passes through it, suffers multiple refraction. This phenomenon is called atmospheric refraction which causes various natural occurance. These are as following :
(i) Twinkling of stars
(ii) The stars appears to look higher than they actually are.
(iii) Advance sunrise and delayed sunset.