Question

Give reason why the stars appear to be twinkling in the sky.

Answer 1

Stars don't twinkle! I guess you know that! The stars are so far away from us that we only observe the tiny lights they emit. The twinkling effect happen because of the refraction of light by the impurities present in our atmosphere. The impurities move about in the atmosphere like water in a river and so what is see is the disturbed wave of light from the star.

Answer 2

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1. The atmoshpere consists of a number of parallel layers of air of varying densities .
2. The most dense layer is near the surface of earth,and least dense later is the top most layer.
3. When the rays of light coming from this star pass through atmosphere of varying densities they bend towards the normal.
4. Finally when the refracted rays of light reach the eye, the eye tracee straight line path.
5. Due to this functions of refractive index of layers,stars appear twinkiling.