Correct Answer: Option A

Explanation

The correct answer is: Tyndall effect.

The Tyndall effect is the scattering of light by particles in a colloid or in a very fine suspension. When a beam of sunlight passes through a colloidal solution, the particles scatter the light, making it visible. This is why we see a beam of light when dust particles are present in the air.

Brownian movement, on the other hand, refers to the random motion of particles suspended in a fluid (such as a gas or liquid) due to collisions with the surrounding fluid molecules.

So, while Brownian movement is related to the motion of particles, the Tyndall effect is specifically about the scattering of light by particles!

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