Question

Twinkling of stars happens due to

• A. refraction in the atmosphere.
• B. reflection in the atmosphere.
• C. dispersion in the atmosphere.
• D. scattering in the atmosphere.

Answer 1

The correct option is A refraction in the atmosphere.

Atmospheric refraction is the cause of twinkling of stars. When light from the stars enters the atmosphere, the constantly moving atmosphere refracts this light in different directions. Thus the stars seems to be twinkling for the observer.