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The twinkling effect of star light is due to:

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Total internal infection

High dense matter of star

Constant burning of hydrogen in the star

Fluctuating apparent position of a star being slightly different from the actual position of a star

answer is D.

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Detailed Solution

The twinkling effect of start light is due to atmospheric refraction i.e., fluctuating apparent position of star being slightly different from the actual position of star.

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