A plane mirror is placed at the bottom of a tank containing a liquid of refractive index μ . P is a small object at a height h above the mirror. An observer O-vertically above P , outside the liquid sees P and its image in the mirror. The apparent distance between these two will be:
(a) 2μh
(b) μ2h
(c) μ−12h
(d) h(1+μ1)