alleryThe blue colour of the sky is best explained by:
ARefraction of light by water vapour (option)
BReflection of light from the oceans
CAbsorption of red light by oxygen
DScattering of blue (short-wavelength) light by air molecules
Answer & Solution
Correct answer: D. Scattering of blue (short-wavelength) light by air molecules
1. Air molecules scatter shorter wavelengths more strongly than longer ones (Rayleigh scattering).
2. Blue light is scattered far more than red.
3. Scattered blue light coming from all directions makes the sky appear blue.
_Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.6_
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