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Assertion (A): When rays of… (Class 10 Science 2026, Q32)

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ScienceCBSE Class 10 · Board exam 2026, set 31/1/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2026: question 32

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section C, question 32, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q32 · 1 mark · Assertion-reasonCompetency-basedThe Human Eye and the Colourful World

Assertion (A): When rays of white light pass through a prism, on emerging they give spectrum of seven colours.
Reason (R): It is due to the scattering of light that red light bends minimum and violet light bends the maximum.

  1. (A)Both, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

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

Hints

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

Hint 1

What is the name of the phenomenon in A?

Hint 2

Is it caused by scattering or by refraction?

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. Assertion: white light passing through a prism splits into a spectrum of seven colours. This is true (dispersion).

  2. Reason: the splitting happens because different colours are refracted (bent) by different amounts, red the least and violet the most. It is due to refraction, not scattering, so R is false. Correct option: (C).

    1 mark

Answer: Option (C)

Where the marks are

  • A true; R false because dispersion is due to refraction, not scattering (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 31/1/1: 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.