- Twinkling of stars.
- Red coloured sun during sunrise and sunset.
- Blue coloured sky and water bodies.
- Formation of mirage.
When the light rays pass through the atmosphere having layers of different densities and refractive indices, then refraction of light takes place. This refraction of light by the earth's atmosphere is called "atmospheric refraction".
E.g. At sunrise and sunset the light coming from the sun has to travel a longer distance through the atmosphere to reach us. Therefore the blue and green components of white light are gets scattered away (removed) almost completely leaving the longer wavelength. Hence, during sunrise and sunset the sun appears reddish.