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The BLUE COLOUR of the SKY (during daytime) is explained by:
AReflection of ocean water off the atmosphere above us
BRefraction by water vapour in the upper layers of air
CAbsorption of red light by ozone layer above us
DTyndall scattering of short-wavelength blue light by air
Answer & Solution
Correct answer: D. Tyndall scattering of short-wavelength blue light by air
The Tyndall Effect: tiny particles in air scatter short-wavelength blue light more than long-wavelength red. At noon, blue is scattered to our eyes from all directions = blue sky. At sunset, blue is scattered away, leaving red-orange to reach us.
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