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A student has difficulty in… (Class 10 Science 2025, Q25a)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 25(a)

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section B, question 25(a), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q25(a) · 2 marks · Very short answerCompetency-basedThe Human Eye and the Colourful World

A student has difficulty in reading his textbooks but can read the blackboard clearly while sitting in the last row. Name the defect of vision the student is suffering from. List two reasons due to which this defect arises. Write the nature of the lenses required to correct this defect.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Which objects can he see clearly – near or far?

Hint 2

In this defect the image of a near object forms behind the retina.

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.

  1. The student can see distant objects clearly but not nearby ones, so the defect is hypermetropia (far-sightedness).

    ½ mark

  2. Reason 1: the focal length of the eye lens is too long.

    ½ mark

  3. Reason 2: the eyeball has become too small (shortened).

    ½ mark

  4. Correction: a convex (converging) lens of suitable power.

    ½ mark

Answer: Hypermetropia; focal length of eye lens too long, eyeball too small; convex (converging) lens

Where the marks are

  • Names hypermetropia (½ mark)
  • Two causes (½ + ½ mark)
  • Convex/converging lens (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from The Human Eye and the Colourful World, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/3/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.