CBSE Class 10 Science 2025: question 14
Set in the CBSE Class 10 board exam of 2025, paper 31/1/1, section A, question 14, for 1 mark. Try it first; the hints and our step-by-step solution are below.
Q14 · 1 mark · MCQThe Human Eye and the Colourful World
An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is 'a' which can be corrected by lens 'b', then 'a' and 'b' respectively are:
- (A)hypermetropia and convex lens
- (B)presbyopia and bifocal lens
- (C)myopia and concave lens
- (D)myopia and bifocal lens
Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/1/1.
Hints
Open one hint at a time and try again before the next.
Hint 1
Which eye defect is linked with ageing?
Hint 2
A lens with both concave and convex parts is used to correct it.
Step-by-step solution
Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.
Weak ciliary muscles and a less flexible eye lens in old age cause presbyopia.
- 1 mark
Such a person often has both near and far defects, which is corrected by a bifocal lens. The answer is option (B).
Answer: Presbyopia and bifocal lens, option (B)
Where the marks are
- Chooses option (B) (1 mark)
Revise the chapter
- Chapter: The Human Eye and the Colourful World (notes, formulas, where marks are lost and every past question)
- Topic: Defects of Vision and Their Correction
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