The main reason for the blueness of the sky is :
- Athe scattering of sunlight by air molecules
- Bthe scattering of white light
- Cthe presence of water vapour
- Dthe absorption of blue light due to the air
Solution & Step-by-step Explanation
The sky appears blue due to a physical phenomenon called Rayleigh scattering. Sunlight passing through Earth's atmosphere is scattered in all directions by the gas molecules and particles in the air. Because blue light travels as shorter, smaller waves compared to other colors in the visible spectrum, it is scattered much more efficiently than longer wavelengths (like red and yellow), causing our eyes to perceive a blue sky.