Question

Twinkling of stars is visible when the stars are

Answer 1

Answer:

Stars twinkle when we see them from the Earth's surface because we are viewing them through thick layers of turbulent (moving) air in the Earth's atmosphere. ... This random refraction results in the star winking out (it looks as though the star moves a bit, and our eye interprets this as twinkling).

Answer 2

Explanation:

1) Our atmosphere is composed of various layers having different densities , temperature and are mobile. Therefore when the light from the star passes through these layers , it has to undergo atmospheric refraction.

2) As we go from higher level to lower levels , the optical density of the atmosphere increases . Therefore light also undergoes atmospheric refraction because of which it bends towards the normal . (Rarer to denser)

3) So , by the time light rays reach our eyes , the light would appear to come from an "apparent position of star" which is away from the "actual position of star"

4) Moreover , these atmospheric layers are quite mobile , and their density and temperature varies from time to time because of which it appears that stars are "twinkling"