Start free

Physics · Geometrical Optics

JEE Main 2025 — 4 April, Evening Shift — Question 43

A finite size object is placed normal to the principal axis at a distance of 30 cm from a convex mirror of focal length 30 cm . A plane mirror is now placed in such a way that the image produced by both the mirrors coincide with each other. The distance between the two mirrors is :

  1. Option A:

    7.5 cm

    Correct
  2. Option B:

    22.5 cm

  3. Option C:

    45 cm

  4. Option D:

    15 cm

Answer: A

Step-by-step solution

1v+1u=1f\frac{1}{v}+\frac{1}{u}=\frac{1}{f}

1v+1−30=130\frac{1}{v}+\frac{1}{-30}=\frac{1}{30}

v=15v=15 Distance =7.5 cm=7.5 \mathrm{~cm}

figure

Answer key and solution verified before publishing.

Practise Geometrical Optics

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Solve a similar one free
Exam
JEE Main 2025
Paper
4 April, Evening Shift
Subject
Physics
Chapter
Geometrical Optics
Topic
Reflection of Light at Curved Surfaces and Spherical Mirrors
A finite size object is placed normal to the principal axis at a… | JEE Main 2025 PYQ with Solution · DhiX AI