The speed of the yellow light in a certain liquid is $2.4 \times 10^8 \mathrm{~m} / \mathrm{s}$. Find the refractive index of the liquid.
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$\mu_\text{t}=\frac{1\times3\times10^8}{(2.4)\times10^8}=1.25$ $\Big[\text{since}, \mu=\frac{\text{velocity of light in vaccum}}{\text{velocity of light in the given medium}}\Big]$
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