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Physics · Geometrical Optics

JEE Main 2026 — 4 April, Morning Shift — Question 13

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm. The length of the image is ______ cm.

Question figure
  1. Option A:

    2.5

  2. Option B:

    5

    Correct
  3. Option C:

    7.5

  4. Option D:

    7

Answer: B

Step-by-step solution

For end A (u=-20): v=-20 cm. For end B (u=-30): v=-15 cm. Image length = 20-15 = 5 cm

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
4 April, Morning Shift
Subject
Physics
Chapter
Geometrical Optics
Topic
Reflection of Light and Plane Mirrors

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