Explain briefly the reason for the blue of the sky.

Explanation

1) The scattering of blue component of the white light by air molecules like `N_(2) "and" O_(2)` present in the atmosphere causes the blue colour of the sky.
2) Our atmosphere contains different types of molecules and atoms.
3) The reason for blue sky is due to the molecules `N_(2) "and" O_(2)` , Which are presented more in the atmosphere.
4) The sizes of these molecules are comparable to the wavelength of blue light.
5) These molecules acts as scattering centres for scattering of blue light.