The velocity of light in diamonds is 121000 kms $^{- 1}$ . What is the refractive index ?

1.47

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2.47

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3.52

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3.86

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Solution

The correct option is C 2.47
Refractive index of diamond $= \frac{velocity of light in vaccum}{velocity of light in diamond}$

$velocity of light in diamond$ = $121000 k m / s = 1.21 \times 10^{8} m / s$

$μ = \frac{3 \times 10^{8}}{1.21 \times 10^{8}} = 2.47$

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