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Rays from the sun converge at… (Class 10 Science 2026, Q30)

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ScienceCBSE Class 10 · Board exam 2026, set 31/5/1 · 1 mark · MCQ

CBSE Class 10 Science 2026: question 30

Set in the CBSE Class 10 board exam of 2026, paper 31/5/1, section C, question 30, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q30 · 1 mark · MCQLight – Reflection and Refraction

Rays from the sun converge at a point 25 cm behind a convex lens. The distance at which an object be placed in front of the lens to get a virtual image, is :

  1. (A)20 cm
  2. (B)40 cm
  3. (C)50 cm
  4. (D)More than 50 cm

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

Where do parallel rays from the sun meet after passing through a lens?

Hint 2

For a virtual image, the object must lie between the optical centre and F.

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. Rays from the sun meet at the principal focus, so f = 25 cm.

  2. A convex lens forms a virtual image only when the object is between the lens and F, that is, closer than 25 cm. Of the options, only 20 cm is less than 25 cm. Answer: (A).

    1 mark

Answer: (A) 20 cm

Where the marks are

  • f = 25 cm; object within f (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Light – Reflection and Refraction, 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.