(D) The refractive index $(n)$ of a medium is defined as the ratio of the speed of light in a vacuum $(c)$ to the speed of light in that medium $(v)$.

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(D) The refractive index $(n)$ of a medium is defined as the ratio of the speed of light in a vacuum $(c)$ to the speed of light in that medium $(v)$.Mathematically,$n = \frac{c}{v}$.Since both $c$ and $v$ are speeds measured in the same units (e.g.,$m/s$),their ratio is a dimensionless quantity.Therefore,the refractive index has no unit.