The apparent depth of an object at the bottom of the tank filled with a liquid of refractive index 1.3 is 7.7 cm. What is the actual depth of the liquid in the tank?

Question

$\begin{array}{1 1} (a)\;10.01 cm \\ (b)\; 100.1 cm \\ (c)\; 1.001 cm \\ (d)\; 0.001 cm \end{array}$