A star at times appears bright and at times fainter what is the effect called?state the reason for this effect
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This effect is known as twinkling effect.It is because of rise in refractive index at some times.
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This effect is called Twinkling effect.
Reason: It is due to atmospheric refraction of starlight. The atmosphere has varying layers. The gradual change in the refractive index of different layers of atmosphere causes atmospheric refraction and starlight undergoes multiple refraction. So, the fluctuation in the position of star occurs continuously due to the changing amount of light entering the eye. The star sometimes appears brighter and at some other times, it appears fainter. This causes twinkling of star.
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