3. “Twinkle, twinkle, litter stars, how I wonder what you are.” The earth is sur

Question

3. “Twinkle, twinkle, litter stars, how I wonder what you are.” The earth is surrounded by an atmosphere which extends to a distance of about 350 km above its surface before it fades away. For the sake of clarity the earth’s atmosphere in figure 1 has been divided into just three layers. The change of n is shown in Fig. 1. (i) If a star observed by a person on the earth at point A, is appearing to be at position S1. Complete the real path taken by light from this star. (ii) What is the ray path for light from star S2? (iii) Can you explain the “twinkling of star”?

Explanation / Answer

you didnt give the Figure. But the all phenomena happens due to refraction. The lighy ray bend towards or away from the normal when it enter into a medium. Different layers have different index of refraction, and they act as different media. When light travels through this media it gets refracted and the star appears like twinkling star

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