Sun appears to be risen before the actual sun rise because of
Scattering of light
Atmospheric dispersion
Atmospheric refraction
Atmospheric reflection
Sun rises two minutes before the actual sunrise due to the phenomenon of atmospheric refraction.
Question 6 Twinkling of stars is due to atmospheric (a) dispersion of light by water droplets (b) refraction of light by different layers of varying refractive indices (c) scattering of light by dust particles (d) internal reflection of light by clouds