The clear sky appears blue because

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(C) The phenomenon responsible for the blue colour of the sky is Rayleigh scattering.According to Rayleigh's law of scattering,the intensity of scatte

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violet and blue lights get scattered more than lights of all other colours by the atmosphere

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(C) The phenomenon responsible for the blue colour of the sky is Rayleigh scattering.According to Rayleigh's law of scattering,the intensity of scattered light is inversely proportional to the fourth power of its wavelength $(I \propto 1/\lambda^4)$.Since violet and blue light have shorter wavelengths compared to other colours in the visible spectrum,they are scattered much more strongly by the fine particles and molecules present in the Earth's atmosphere.As a result,when sunlight enters the atmosphere,these shorter wavelengths reach our eyes from all directions,making the sky appear blue.

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