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Study the figure in which the… (Class 10 Science 2025, Q24)

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ScienceCBSE Class 10 · Board exam 2025, set 31/6/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 24

Set in the CBSE Class 10 board exam of 2025, paper 31/6/1, section B, question 24, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q24 · 2 marks · Very short answerLight – Reflection and Refraction

Study the figure in which the path of a ray of light going from Medium 1 to Medium 2 is shown.

  1. (a)

    Out of the two Media – Medium 1 and Medium 2, in which is the speed of light more ?

    0 marks
  2. (b)

    State reason of bending of the refracted ray away from the normal.

    0 marks
  3. (c)

    Express refractive index of Medium 2 with respect to Medium 1 in terms of speed of light in two media.

    0 marks

Figure in the paper: A rectangular box showing a horizontal boundary between Medium 1 (above) and Medium 2 (below), with a dashed normal perpendicular to the boundary. Incident Ray comes in from the upper left in Medium 1 and the Refracted Ray goes to the lower right in Medium 2, bending away from the normal. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/6/1.

Hints

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

Hint 1

A ray bends away from the normal when it enters a medium where light travels faster.

Hint 2

For the refractive index of medium 2 with respect to medium 1, the speed in medium 1 goes in the numerator.

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. (a) The speed of light is more in Medium 2.

    ½ mark

  2. (b) The ray travels from an optically denser medium (Medium 1) to an optically rarer medium (Medium 2). Light speeds up on entering Medium 2, so it bends away from the normal.

    ½ mark

  3. (c)

    1 mark

Answer: (a) Medium 2; (b) light goes from a denser to a rarer medium (it speeds up); (c)

Where the marks are

  • Medium 2 (½ mark)
  • Reason: denser to rarer medium / speed increases (½ mark)
  • (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 paper2025 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.