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A student wants to obtain an… (Class 10 Science 2023, Q7)

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

CBSE Class 10 Science 2023: question 7

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQLight – Reflection and Refraction

A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What will be the distance of the object from mirror?

  1. (A)Less than 10 cm
  2. (B)10 cm
  3. (C)between 10 cm and 20 cm
  4. (D)more than 20 cm

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

For which object position does a concave mirror give a virtual image?

Hint 2

Compare that position with the focal length.

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 concave mirror forms an erect (virtual, enlarged) image only when the object is between the pole P and the focus F.

  2. Here cm, so the object must be less than 10 cm from the mirror. Hence the answer is option (A).

    1 mark

Answer: Less than 10 cm, option (A)

Where the marks are

  • Object between P and F, i.e. less than 10 cm (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 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.