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why sky is blue in colour?
The blue colour of the sky is due to the scattering of the sunlight by the molecules of the atmosphere.The molecules of air such as N2 and O2, have sizes smaller than the wavelength of visible light.As sunlight passes through the atmosphere,these molecules absorb some amount of sunlight and re-emit it.They scatter blue light of shorter wavelength more strongly than red light of longer wavelength.When we look at the sky,the scattered light enters our eyes and this light contains blue light in a larger proportion.that is, sky appears blue.


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