One cannot see through fog because ____.

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Fog absorbs light

Refractive index of fog is unity

Light suffers total internal reflection at the droplets in fog

Light is scattered by the droplets in fog

answer is D.

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Detailed Solution

Concept: Fog is a cloud of water droplets or ice crystals that floats near the Earth's surface in the atmosphere. The formation of clouds near the earth's surface is also known as fog. The main difference is that there will be fog near the ground and clouds in the sky.
The fog is made up of water droplets, dust, smoke, and other particles. Certain substances can scatter light when it lands on them.
The observer is unable to see anything clearly as a result of the light scattering. As a result, driving is not suggested while fog is present. We can only see obstacles or other vehicles when it gets quite close to us. This phenomenon is also known as the Tyndal effect.
Hence, option 4 is correct.

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