Question

Why does sky look blue and clouds look white?

Answer 1

1. Blue colour of the sky is due to the scattering of sunlight by air molecules. According to Rayleigh’s law, I α `1/λ^4` So blue light (λ_min) is scattered much more.
2. Clouds have large particles like dust and water droplets which scatter light of all colours almost equally. Hence clouds generally appear white.