The Tyndall effect is associated with:

Correct answer: (d) Scattering of light

Explanation

The Tyndall effect is the scattering of light by particles in a colloid or a fine suspension. The particles are large enough to scatter light, so a beam passing through becomes visible.

Examples: a beam of sunlight in a dusty room or through the gaps in a forest canopy, car headlights in fog, and light passing through milk or starch solution. A true solution, such as salt in water, has particles too small to scatter light and shows no Tyndall effect. It is named after the physicist John Tyndall.