One cannot see through fog because :
fog absorbs light.
the refractive index of fog is infinity.
light suffers total internal reflection at the droplets of fog.
light is scattered by the droplets of fog.
One cannot see through fog because light is scattered in every direction by the droplets of fog.
Question 9 The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light: (a) is scattered the most by smoke or fog (b) is scattered the least by smoke or fog (c) is absorbed the most by smoke or fog (d) moves fastest in air