Sun appears red in colour at sunrise and sunset due to

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the fact that sun emits only red colour at that time

Red light having longer wave length scatters away

That sun comes out of the mountains

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

answer is D.

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Detailed Solution

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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