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An object is placed in front… (Class 10 Science 2023, Q13)

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ScienceCBSE Class 10 · Board exam 2023, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 13

Set in the CBSE Class 10 board exam of 2023, paper 31/2/1, 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

An object is placed in front of a convex mirror at infinity. According to the New Cartesian Sign Convention, the sign of the focal length and the sign of the image distance in this case are respectively :

  1. (A)+ , −
  2. (B)− , +
  3. (C)− , −
  4. (D)+ , +

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/2/1.

Hints

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

Hint 1

Distances measured behind the mirror are positive.

Hint 2

Where does a convex mirror form the image of an object at infinity?

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. For a convex mirror, the focus lies behind the mirror, so is positive.

  2. For an object at infinity, the virtual image forms at F behind the mirror, so is also positive.

    1 mark

Answer: (D) +, +

Where the marks are

  • Both signs positive (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 31/2/1: 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.