b
(b) Image formation by a mirror (either plane or spherical) does not depend on the medium.

The image of \(P\) will be formed at a distance h below the mirror.

If \(d =\) depth of liquid in the tank.

Apparent depth of \(P = {x_1} = \frac{{d - h}}{\mu }\)

Apparent depth of the image of \(P = {x_2} = \frac{{d + h}}{\mu }\)  

Apparent distance between \(P\) and it's image \( = {x_2} - {x_1} = \frac{{2h}}{\mu }\)