Physics - Geometrical Optics Question with Solution | TestHub

Let the thickness of the glass slab is $t$ and distance of the bubble from one side is $x$. $\begin{array}{rl}& \therefore \frac{x}{\mu }=5\mathrm{cm}---(1)\\ & \therefore \frac{t-x}{\mu }=2\mathrm{cm}--(2)\end{array}$ By solving equation (1) and (2), we get, $t=7\mu \mathrm{cm}=10.5\mathrm{cm}$