CBSE 2025 · Region 4 · Set 3 · Q20 · 1 mark
Assertion (A) : White light is dispersed by a glass prism into seven colours.
Reason (R) : The red light bends the least while the violet the most when a beam of white light passes through a glass prism.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both, Assertion (A) and Reason (R) are true, and Reason (R) is not the correct explanation of Assertion (A).
The Human Eye and the Colourful WorldDispersion of White Light by a Glass PrismAnalyseassertion_reasoneasy
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.