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Science · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 1 · Q31
Name and explain the phenomenon of light due to which the path of a beam of light becomes visible when it enters a smoke filled room through a small…
Name and explain the phenomenon of light due to which the path of a beam of light becomes visible when it enters a smoke filled room through a small hole. Also state the dependence of colour of the light we receive on the size of the particle of the medium through which the beam of light passes.
Marking-scheme solution
Scattering of light / Tyndall effect
When a beam of light strikes fine particles of smoke, it is reflected diffusely and the path of the light becomes visible.
Very fine particles scatter mainly blue light/short wavelength colours while the particles of larger size scatter longer wavelength colours.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.