The clear sky appears blue because:

Correct option is C

The correct answer is (C) Violet and blue light are scattered more by the atmosphere than light of all other colours.

Explanation:
• The blue sky appears blue due to a phenomenon called Rayleigh scattering, where shorter wavelengths of light (like violet and blue) are scattered more by the gases and particles in Earth's atmosphere than longer wavelengths (like red or yellow).
• Although violet light is scattered even more than blue, our eyes are more sensitive to blue light, and some of the violet light is absorbed by the upper atmosphere, making the sky appear predominantly blue.

Information Booster:
• Rayleigh scattering occurs because the atmosphere is made up of molecules that are much smaller than the wavelength of visible light, causing light to scatter in all directions.
• The sky would appear violet if our eyes were more sensitive to violet light.

Additional Knowledge:
Blue light gets absorbed in the atmosphere (Option A)
• This is incorrect. Blue light is not absorbed but scattered by the atmosphere.

Ultraviolet radiations are absorbed in the atmosphere (Option B)
• Ultraviolet (UV) light is largely absorbed by the ozone layer, but this does not directly cause the blue appearance of the sky.

Light of other colors is scattered more by the atmosphere than violet and blue light (Option D)
• This is incorrect. Violet and blue light are scattered more due to their shorter wavelengths, not the other colors.