Twinkling of stars is due to atmospheric (1) dispersion of light by water droplets (2) refraction of light by different layers of varying refractive indices (3) scattering of light by dust particles (4) internal reflection of light by clouds

Answer: (2) refraction of light by different layers of varying refractive indices

The refraction of light by various layers of different refractive indices is the explanation for the twinkling of stars. A star doesn’t necessarily twinkle when we see that from the surface. It always emits light, but our environment allows it to seem like a twinkle. With different refractive indexes, our atmosphere has different layers.

When light hits the earth’s atmosphere from a distance, it begins to refract the light into any layer that reaches. That’s why we see the twinkling of stars.

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    1. What causes the twinkling of stars at night?
    2. Why do stars twinkle and planet do not?

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