The unit of refractive index is:

m / s

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No units

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k g / m^{3}

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N

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Solution

The correct option is B No units
Correct answer is (b)

Refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium.Therefore, it has no units.

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The unit of relative density is :
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(c) $m^{3} k g^{- 1}$ (d) no unit.

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