Home › CBSE Class 10 › Physics › Human Eye and Colourful World › Tyndall effect — the visible path of a beam of l…
Tyndall 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: NCERT Class 10 Science Ch 10 §10.5 Scattering (Tyndall effect)_
Related questions
Light from a star changes colour during twinkling because:The ability of the eye to focus on objects at different distances is called:An old man cannot read a book held close but can see distant scenes clearly. The defect anTwinkling of stars is caused by:The reddish appearance of the sun at sunrise and sunset is due to:The sky appears BLUE because of:A rainbow is formed by:Dispersion of white light by a prism produces a spectrum because: