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In the following… (Class 10 Science SQP 2024-25, Q13)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2024-25: question 13

From the official CBSE sample question paper for 2024-25, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · MCQLight – Reflection and Refraction

In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?

  1. (A)A ray parallel to the principal axis.
  2. (B)A ray passing through the centre of curvature and incident obliquely.
  3. (C)A ray passing through the principal focus and incident obliquely.
  4. (D)A ray incident obliquely to the principal axis, at the pole of the mirror.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

The angle of incidence is measured from the normal.

Hint 2

Which ray travels along the normal to the mirror?

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 line through the centre of curvature to any point on a concave mirror is a radius, so it is normal to the mirror at that point.

    ½ mark

  2. A ray travelling along the normal makes an angle of incidence of and retraces its path. The answer is option (B).

    ½ mark

Answer: A ray passing through the centre of curvature; option (B)

Where the marks are

  • Recognises that a ray through C travels along the normal, so i = 0 (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 paperSample paper 2024-25: 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.