$A$ concave mirror of radius of curvature $h$ is placed at the bottom of a tank containing a liquid of refractive index $\mu$ up to a depth $d$. An object $P$ is placed at a height $h$ above the bottom of the mirror. Outside the liquid,an observer $O$ views the object and its image in the mirror. The apparent distance between these two will be

• A
  $0$
• B
  $\frac{2h}{\mu}$
• C
  $h\left(1 - \frac{1}{\mu}\right)$
• D
  $\frac{2h}{\mu - 1}$