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Q.

Sun appears red in colour at sunrise and sunset due to

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a

the fact that sun emits only red colour at that time   

b

Red light having longer wave length scatters away   

c

That sun comes out of the mountains   

d

the fact that red is being un-scattered in the spectrum

answer is D.

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Detailed Solution

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Because the sun's rays are so close to the horizon during sunrise and sunset, they must traverse a bigger portion of the atmosphere. Light that isn't red is therefore primarily scattered away. Our eyes receive the most of the red light, which is the least dispersed. As a result, the sky and sun appear to be red.

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