Question

which optical phenomenon that causes stars to twinkle ?​

Answer 1

Answer:

atmospheric refractions

The optical phenomena twinkling of stars is due to atmospheric refraction.

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Answer 2

Explanation:

scintillation effects

In simple terms, twinkling of stars is caused by the passing of light through different layers of a turbulent atmosphere. Most scintillation effects are caused by anomalous atmospheric refraction caused by small-scale fluctuations in air density usually related to temperature gradients.