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The clear sky appears blue because:

1. blue light gets absorbed in the atmosphere.
2. ultraviolet radiations are absorbed in the atmosphere.
3. violet and blue lights get scattered more than lights of all other colours by the atmosphere.
4. light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

Correct answer: violet and blue lights get scattered more than lights of all other colours by the atmosphere.

Solution

The atmosphere scatters shorter-wavelength visible light much more strongly than longer wavelengths. Violet and blue are scattered the most, so the sky looks blue to our eyes.

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