The optical phenomena, twinkling of stars, is due to a. Atmospheric reflection b. Total reflection c. Atmospheric refraction d. Total refraction
The correct option is C refraction When light rays from a distant star pass through the earth's atmosphere, they change their direction continuously due to the varying optical density of the atmosphere. Also the changing physical conditions of the atmosphere affect the amount (brightness) of starlight entering our eyes. Thus, stars appear to twinkle in the night sky.
