The refractive indices of water and diamond are 4/3 and 2.42 respectively. Find the speed of light in water an

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4/3

Maharashtra MsbshseMaharashtra HSC (MSBSHSE) Board 2018Subjective· 3mImportance★★★★★

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Refractive index is defined as $n = c/v$ , so the speed of light in a medium is simply $v = c/n$ .

The refractive index of a medium is $n = \dfrac{c}{v}$ , so the speed of light in that medium is $v = \dfrac{c}{n}$ .

In water ( $n_w = 4/3$ ):

$v_w = \frac{c}{n_w} = \frac{3\times10^8}{4/3} = 3\times10^8\times\frac34 = 2.25\times10^8\ \text{m/s}.$

In diamond ( $n_d = 2.42$ ): …

Q.The refractive indices of water and diamond are $4/3$ and 2.42 respectively. Find the speed of light in water and diamond. ( $c = 3 \times 10^8$ m/s)