Question

2. Cause of motion of atmospheric air and changing air density and not
temperature continuously, the refractive index also changes continuously​

Answer 1

Answer:

The twinkling of stars is due to atmospheric refraction of star-light. The refraction of light caused by the earth's atmosphere having air layers of varying optical density is called atmospheric refraction.

The physical conditions of the atmosphere keep on changing continuously due to which density of air in different layers of atmosphere also keeps on changing.

As a result of this, the refractive index of the various layers of atmosphere also keeps on changing continuously. So, light coming from stars suffers multiple refraction. This causes the direction of the ray coming from stars to change, consequently causing the shift in the position of the image of stars in random directions. Also, the amount of starlight reaching the eye also keeps changing and so, due to fluctuation of perceived brightness of the star, they appear like they are twinkling.

Explanation:

plz mark my answer as a brainiest and follow me