Q.

The redness in atmosphere at Sunrise and Sunset is due to –

A. Refraction of light
B. Reflection of light
C. Dispersion of light
D. Scattering of light
Answer» D. Scattering of light
Explanation: The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere - and therefore bounce off more molecules -than at other times of day.
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