Question

Why is the colour of clear sky is blue ? ​

Answer 1

Explanation:

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

Explanation:

Because dispersion of light is inversely proportional to the forth powe of wavelength .

Wavelength of blue light is half of the wavelengh of red light . So blue light spreads more than red light and hence we can say that clear sky appears blue