a sunlight consists of seven colours (violet,indigo,blue,green,yellow,orange,red) VIBGYOR.The wavelength of the violet colour is lowest amongst this seven colour and the wavelength of the red colour is highest.Our atmosphere consists of many particles ,gases etc.We know when a particular light collides with a particle it gets scattered and the phenomnon is called scattering.This scattering is related to wavelength by the given relation.......
degree of scattering is inversely proportinal to the 4th root of wavelength.So when a sunlight comes to our earth , the violet colour of it having the lowest wavelength gets highly scattered while the red colour gets scattered to a small degree.So when a person see towards sky neither the violet nor the red colour reaches his eye only blue colour which has got medium wavelength gets scattered to some degree such that it reaches the earth and so it appears blue to us. Thus sky appears blue to us.
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