Question

1.Why do stars twinkle

2.Explain how twinkling of stars is due to atmospheric refraction?​

Answer 1

Answer:

As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the star's appearance to wobble or twinkle

The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth's atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index.

Explanation:

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Answer 2

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Why do stars twinkle?

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When a ray of light travels from one medium to another it ‘bends’. This phenomenon is referred to as refraction. If it travels from a rare medium to a dense medium, it bends towards the normal and if it travels from a dense medium to a rarer medium, it bends away from the normal. The speed at which the light travels changes depending on the medium and therefore this bending occurs.

This effect can be observed when light passes through a prism or a glass slab and even when light passes through water. The light ray actually travels from air to a medium of different density here.

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Explain how twinkling of stars is due to atmospheric refraction?

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Reflection of light is the phenomenon in which light travelling from one medium when strikes the surface of another medium, returns to the first medium.

Refraction of light is the phenomenon in which light travelling from one medium to another medium, bends away or towards the normal.

Scattering of light is the phenomenon in which light travelling from one medium to another is absorbed by the second medium and then is radiated out in a particular direction. Dispersion of light is the phenomenon in which white light when passed through a glass prism splits into its seven constituent colors.

Twinkling of stars is caused due to layers of atmosphere. When light from stars enters the atmosphere then it passes through different densities, temperatures and many factors. This causes the light to bend. And there is a difference in the actual position and the apparent position. This appears as twinkling. Rays of light from stars bend when they travel from one medium to another. So we can conclude that twinkling of stars is due to atmospheric refraction of light.

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