First slide

Refraction of light

Question

To an observer on the earth the stars appear to twinkle. This can be ascribed to

Easy

A

The fact that stars do not emit light continuously
B

Frequent absorption of star light by their own atmosphere
C

Frequent absorption of star light by the earth's atmosphere
D

The refractive index fluctuations in the earth's atmosphere

Solution

Refractive index of earth's atmosphere is variable through out the atmosphere, it fluctuates with altitude which makes the stars appears to twinkle.

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