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Showing dispersion of white… (Class 10 Science 2023, Q13)

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ScienceCBSE Class 10 · Board exam 2023, set 31/6/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 13

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · MCQThe Human Eye and the Colourful World

In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q' respectively are

  1. (A)Red and Violet
  2. (B)Violet and Red
  3. (C)Red and Blue
  4. (D)Orange and Green

Figure in the paper: A triangular glass prism with white light entering from the left. Two emergent rays are shown: Q is the ray deviated less (upper ray), and P is the ray deviated more (lower ray). The angle of deviation between the two emergent rays is marked with an arc. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/6/1.

Hints

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

Hint 1

Which colour is deviated the most by a prism?

Hint 2

Match the ray with more deviation to that colour.

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. Violet light bends the most and red light bends the least when passing through a prism.

  2. P is deviated more, so it is violet; Q is deviated less, so it is red. Hence the answer is option (B).

    1 mark

Answer: Violet and Red, option (B)

Where the marks are

  • P violet, Q red (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 paper2023 board paper, set 31/6/1: 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.