Tyndall effect
The Tyndall effect is the scattering of light by colloidal particles, making the path of a light beam visible.
Practice This ConceptMain explanation
Teacher explanation
When a beam of light passes through a medium containing very fine suspended particles, those particles scatter the light sideways. This makes the beam's path visible. The effect is seen in fog, smoke, and dusty rooms because the particles are large enough to scatter light but still remain suspended.
Example
A beam from a torch becomes visible in a dusty room because dust particles scatter the light.
Simple analogy
Tiny particles scatter, so the beam shows itself.
Common confusion
Students often think the Tyndall effect is the same as ordinary reflection. It is actually light scattering by fine particles.
Exam tip
In exam answers, mention colloidal particles and the visible beam path. That is the core idea.
Answer writing and exam use
1-mark use
Write the exact meaning of tyndall effect in one clean line.
2-mark use
Define tyndall effect and add one example or condition.
3-mark use
Explain tyndall effect, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
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