Physics - Geometrical Optics Question with Solution | TestHub

Given thickness of glass slab $=4\mathrm{cm}$ and height of water column $=5\mathrm{cm}$ and refractive index of glass ${\mu }_g=\frac{5}{3}$ As number of waves is equal in both the glass and water medium, then according to their height and thickness, we can write $\begin{array}{rl}& \frac{{\mu }_w}{{\mu }_g}=\frac{v_g}{v_w}=\frac{\frac{\text{ thickness of glass }}{\text{ time }}}{\frac{\text{ height of water column }}{\text{ time }}}\\ & \Rightarrow \frac{{\mu }_w}{{\mu }_g}=\frac{4}{5}\\ & \Rightarrow {\mu }_w=\frac{4}{5}\times \left(\frac{5}{3}\right)=\frac{4}{3}\end{array}$