The twinkling of stars is due to atmospheric

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Dispersion of light by water droplets

Refraction of light by different layers of varying refractive indices

Scattering of light by dust particles

Internal reflection of light by clouds

answer is B.

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Detailed Solution

The twinkling of stars is due to the atmospheric refraction of light by different layers of varying refractive indices.
“Refraction is the phenomenon of bending of light as it goes obliquely from one medium to another.” The bending of light rays causes atmospheric refraction once they pass through the layers of the earth’s atmosphere, which are of various optical densities. The refraction of light by various layers of various refractive indices is the cause of the twinkling of stars.

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