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Q.

Why does the clear sky appear blue?


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a

Because blue light gets absorbed in the atmosphere

b

Ultraviolet radiations are absorbed in the atmosphere

c

Violet and blue lights get scattered more than lights of all other colours by the atmosphere

d

Light of all other colours is scattered more than the violet and blue colour lights by the atmosphere 

answer is C.

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Detailed Solution

The clear sky appears as blue and violet, and blue lights get scattered more than lights of all other colours by the atmosphere. This is because white light enters the earth’s atmosphere. It gets scattered away due to the atmospheric particles. The amount of scattering is inversely proportional to the wavelength, so the blue colour scatters the most, and thus the sky appears blue.
 
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