Question

Explain why the colour of clear sky is blue an astronaut in space find sky to be the sun looks reddish at the time of sunrise and sunset

Answer 1

The sun looks reddish at the tie of sunset  because sun at the horizon  needs to pass through a thicker layer of air and larger distance so most of the colors of shorter wavelength is being scattered and the light that reaches us will be of longer wavelength.

Answer 2

1.When light comes from atmosphere it gets scattered by molecules of air , dust , water vapours ,etc

Light of indigo & violet colur is scattered in greater extent.

Hence colour of clear sky appears blue

2.At the time of sunrise & sunset sun is closer to horizon.

Hence sunlight has to pass thick atmosphere to reach earth surface.

Hence more light is scattered.

Hence sun looks reddish.