Q.

The phenomenon of light associated with the appearance of blue colour of the sky is –

A. Interference
B. Reflection
C. Refraction
D. Scattering
Answer» D. Scattering
Explanation: During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small- particle limit called Rayleigh scattering.
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