What is scattering of light ? And on which doe the scattering depend ?

Explanation

As sunlight travels through the earth.s atmosphere it gets scattered (changes it: direction) by the atmospheric particles. Light o shorter wavelengths is scattered much more than light of longer wavelengths.
The amount of scattering is inversely proportional to the fourth power of the wavelength. This is known as Rayleigh scattering
Hence, the bluish colour predominates in a clear sky since blue has a shorter wavelength than red and is scattered much more strongly.
In fact, violet gets scattered even more than blue, having a shorter wavelength.
Large particles like dust and water droplets, present in the atmosphere behave differently.
The relevant quantity here is the relative size of the wavelength of light `lambda` and the scatterer (of typical size say a).
For a `lt lt lambda`, one has Rayleigh scattering which is proportional to `(1)/(lambda^4)`
If a `gt gt lambda` then it is called geo-metric scattering.
If a = `lambda`, then it is called mie scattering.