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Science · 2025 · 2 marks
CBSE 2025 · Region 2 · Set 1 · Q25
(a) Out of the two lenses, one concave and the other convex, state which one will diverge a parallel beam of light falling on it. Draw a ray diagram…
(a)
Out of the two lenses, one concave and the other convex, state which one will diverge a parallel beam of light falling on it. Draw a ray diagram to show the principal focus of the lens.
OR
(b)
A ray of light after refraction from a convex lens emerges parallel to its principal axis.
(i)
Draw a labelled ray diagram to show it.
(ii)
In this case, the incident ray before refraction from the lens passes through a point on its principal axis. Name the point.
Marking-scheme solution
(a) Concave lens
OR
(b) (b)
(i) 
(ii) Principal focus /Focus
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.