The speed of light in a certain medium is V while its speed in a vacuum is C. The absolute refractive index of the medium is
Answer Details
The absolute refractive index of a medium is the ratio of the speed of light in a vacuum to the speed of light in that medium. Therefore, the formula for the absolute refractive index of the medium is:
\[\text{Absolute refractive index} = \frac{\text{Speed of light in vacuum}}{\text{Speed of light in the medium}} = \frac{C}{V}\]
Therefore, the answer is \(\frac{C}{V}\).