Consider three media P, Q and R with refractive indices 1, 1.25, and 1.5, respectively. The medium Q having a thickness of 5 cm is placed between…

Consider three media P, Q and R with refractive indices $\displaystyle 1$, $\displaystyle 1.25$, and $\displaystyle 1.5$, respectively. The medium Q having a thickness of $\displaystyle 5$ cm is placed between extended media P and R as shown in the figure. An object O is placed at the center of medium Q. If viewed from medium P near the normal direction, the apparent depth of O is $\displaystyle \mathrm{h}_1$. For similar observation from medium R, the apparent depth is $\displaystyle \mathrm{h}_2$. The value of $\displaystyle \left|\mathrm{h}_1-\mathrm{h}_2\right|$, in cm, is :