Physics · Geometrical Optics

JEE Main 2025 — 23 January, Evening Shift — Question 65

A concave mirror of focal length f in air is dipped in a liquid of refractive index μ. Its focal length in the liquid will be :

Option A:
$\frac{f}{\mu}$
Option B:
$\frac{f}{(\mu-1)}$
Option C:
$\mu f$
Option D:
$f$
Correct

Answer: D

Step-by-step solution

Focal length of mirror will not change because focal length of mirror doesn't depend on medium.

Answer key and solution verified before publishing.

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Exam: JEE Main 2025
Paper: 23 January, Evening Shift
Subject: Physics
Chapter: Geometrical Optics
Topic: Experiments for Determination of Focal Length of Lens & Mirrors

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