The star appear shifted from their actual position due to the phenomenon of:

Blue colour of the sky is due to the phenomenon of:

The __ colour is at the top and ____ colour is at the bottom of spectrum.

The angle at which the ray gets deviated is called :

A transparent refracting material which is bounded by two plane refracting surfaces is :

The splitting of white light into different colours on passing through a prism is called

Twinkling of stars is due to

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

The air layer of atmosphere whose temperature is less then the hot layer behave as optically