alleryTyndall effect — the visible path of a beam of light through a colloid — is a result of:
AAbsorption by the medium
BPolarisation by impurities
CRefraction by water droplets
DScattering by colloidal particles
Answer & Solution
Correct answer: D. Scattering by colloidal particles
1. Colloidal particles (size 1-1000 nm) scatter light strongly.
2. Hence the beam becomes visible from the side — the Tyndall effect.
3. Same effect explains why a beam through a forest mist or smoky room is visible.
_Source: syllabus Science Ch 10 §10.5 Scattering (Tyndall effect)_
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