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Q.

To an observer on the earth the stars appear to twinkle. This can be ascribed to

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a

The fact that stars do not emit light continuously

b

Frequent absorption of star light by their own atmosphere

c

Frequent absorption of star light by the earth's atmosphere

d

The refractive index fluctuations in the earth's atmosphere

answer is D.

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Detailed Solution

Refractive index of earth's atmosphere is variable through out the atmosphere, it fluctuates with altitude which makes the stars appears to twinkle.
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