Question

why sky is blue?????

Answer 1

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Answer 2

The scattering of blue component of the white light by air molecules present in the atmosphere causes the blue colour of the sky .