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(i) How does the change in… (Class 10 Science 2026, Q34A)

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ScienceCBSE Class 10 · Board exam 2026, set 31/5/1 · 2 marks · Very short answer

CBSE Class 10 Science 2026: question 34(A)

Set in the CBSE Class 10 board exam of 2026, paper 31/5/1, section C, question 34(A), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q34(A) · 2 marks · Very short answerThe Human Eye and the Colourful World

(i) How does the change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly ?
(ii) State the range of the power of accommodation of a normal human eye.

  1. (i)

    How does the change in curvature of the eye lens help us in the process of seeing the nearby objects clearly ?

    0 marks
  2. (ii)

    State the range of the power of accommodation of a normal human eye.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/5/1.

Hints

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

Hint 1

Think about what the ciliary muscles do when you read a book.

Hint 2

A thicker lens bends light more — what happens to its focal length? Recall the near and far points of a normal eye.

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. (i) For nearby objects the ciliary muscles contract, so the eye lens becomes thicker (curvature increases); its focal length decreases, and the image of the near object is formed sharply on the retina.

    1 mark

  2. (ii) A normal eye can see clearly from its near point 25 cm to its far point at infinity.

    1 mark

Answer: (i) Curvature increases, focal length decreases, image focused on retina; (ii) 25 cm to infinity

Where the marks are

  • Curvature increases so focal length decreases (1 mark)
  • Range 25 cm to infinity (1 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 paper2026 board paper, set 31/5/1: 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.