Question

Why sky appear blue instead of Violet??

Answer 1

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Answer 2

This is due to scattering.
When white light of the sun enters the atmosphere of the earth it gets scattered by the air molecules into its constituent colors. The wavelength of voilet and indigo colour is the least therefore it gets scattered the most and vanishes in the sky before reaching our eye. After these lie the blue colour which falls on our eye and therefore the sky appears blue to us.

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