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CBSE - X - Physics - Light - Reflection and Refraction

Why do stars twinkle at night?Explain.

Asked by ashwati 21st February 2009, 9:43 PM
Answered by Expert


The air near the earth being always in motion due to convection currents, its density does not remain constant at all the points, it goes on changing, even at points in the same level and therefore, the refractive index at different points goes on changing. So, the rays from a star  travelling in a given directiuon are somtimes concentrated at one point and sometimes at another which results in the twinkling of stars.

Answered by Expert 22nd February 2009, 12:16 PM

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