A concave mirror of focal length f in vacuum is placed in a medium of refractive index 2. Its focal length in the medium is

Question

A concave mirror of focal length f in vacuum is placed in a medium of refractive index 2. Its focal length in the medium is (A)  (f/2)  (B)  f  (C)  2f  (D)  4f

Tardigrade Admin · Accepted Answer

Focal length of mirror is independent of the refractive index of medium in which it is placed.

Q. A concave mirror of focal length f in vacuum is placed in a medium of refractive index 2. Its focal length in the medium is

$\frac{f}{2}$

$f$

$2 f$

$4 f$

Focal length of mirror is independent of the refractive index of medium in which it is placed.

Q. A concave mirror of focal length f in vacuum is placed in a medium of refractive index 2. Its focal length in the medium is

2f​

f

2f

4f

Focal length of mirror is independent of the refractive index of medium in which it is placed.

$\frac{f}{2}$

$f$

$2 f$

$4 f$