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Science · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 1 · Q34
Attempt either (a) or (b): (a) How does the focal length of eye lens change as the distance of the object from the eyes is altered? Explain.
Attempt either (a) or (b) :
(a)
How does the focal length of eye lens change as the distance of the object from the eyes is altered ? Explain.
OR
(b)
Why is the concave lens used as a corrective lens for a myopic eye ?
Marking-scheme solution
If the distance of the object from the eye is increased, ciliary muscles relax, lens becomes thin and so the focal length increases.
If the distance between the object from the eye is decreased, the ciliary muscles contract, lens becomes thick and the focal length decreases.
(b) In myopic eye image is formed in front of the retina. A concave lens / diverging lens of suitable power will bring the image back on to the retina.
CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.