To an observer on the earth the stars appear to twinkle. This can be ascribed to which of the following options?

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The fact that stars do not emit light continuously

Frequent absorption of star light by their own atmosphere

Frequent absorption of star light by their earth’s atmosphere

The refractive index fluctuations in the earth’s atmosphere

answer is D.

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Detailed Solution

To an observer on the earth the stars appear to twinkle. This can be ascribed the refractive index fluctuations in the earth’s atmosphere.
When starlight enters the earth’s atmosphere, it gets affected by a large number of particles, and there is a different refractive index at different places in the atmosphere due to changes in temperature and densities. Because of the refractive index fluctuation in the earth’s atmosphere, the stars appear to twinkle.

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