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Refractive index of glass is $\frac{3}{2}$ and refractive index of water is $\frac{4}{3}$. If the speed of light in glass is $2.00 \times 10^8 \mathrm{~m} / \mathrm{s}$, the speed in water will be
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$2.25 \times 10^8 \mathrm{~m} / \mathrm{s}$
$\begin{aligned} \mu \propto \frac{1}{v} & \Rightarrow \frac{\mu_g}{\mu_w}=\frac{v_w}{v_g} \Rightarrow \frac{3 / 2}{4 / 3}=\frac{v_w}{2 \times 10^8} \\ & \Rightarrow v_w=2.25 \times 10^8 \mathrm{~m} / \mathrm{s}\end{aligned}$
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