Twinkling of stars at night happens due to-

Correct option is A

The correct answer is (a) Atmospheric refraction.
· Atmospheric refraction is the bending of light as it passes through the Earth's atmosphere, which has varying densities. This refraction causes the light from stars to bend and shift slightly as it travels to the observer's eye.
· The stars appear to twinkle because the density of the atmosphere changes due to turbulent air currents, causing the light path to fluctuate. As a result, the light intensity and position of the star appear to vary, creating a twinkling effect.
Information Booster:
· Reflection of light: This is the bouncing back of light from a surface, not responsible for the twinkling of stars.
· Scattering of light: This occurs when particles in the atmosphere cause light to spread in different directions, which is responsible for phenomena like the blue sky, but not directly for the twinkling of stars.
· Dispersion of light: This is the separation of light into its constituent colors (as seen in rainbows), and it does not cause the twinkling of stars.