Answer:
(B) The twinkling of a star is due
to atmospheric refraction of lights of stars, these lights,on entering the
earth's atmosphere, undergoes refraction continuously before it reaches the
earth.
The path of rays of light coming from
the distant star goes on varying slightly, the apparent position of the star
fluctuates and the amount of starlight entering the eye flickers. The star
sometimes appears brighter and at some other time, fainter gives us the
twinkling effect.
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