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JEE Main 202523 JanuaryEvening Shift

Exam: JEE Main
Year: 2025
Date: 23 January
Shift: Evening Shift
Subject: Physics
Chapter: Ray Optics

JEE Main 2025 · 23 January · Evening Shift · Physics · Ray Optics

A concave mirror of focal length f in air is dipped in a liquid of...

A concave mirror of focal length

f

in air is dipped in a liquid of refractive index

\mu

. Its focal length in the liquid will be:

Options

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

Correct answer

B. $f$

Step-by-step solution

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

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