Sun is visible a little before the actual sunrise and until a little after a actual sunset. This is due to

Options

A. scattering of light
B. diffraction of light
C. refraction of light
D. dispersion of light

Answer

C

Explanation

Refraction of sun rays through atmospheric air causes bending of rays and and sun rays reach us even before the sun rises above the horizon. Also, the sub rays continue to reach us after the sun had gone below the horizon.