what is refractive index?
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The ratio of the velocity of light in a vacuum to its velocity in a specified medium.
Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another.
Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.
Refractive index is used to measure solids, liquids, and gases. Most commonly it is used to measure the concentration of a solute in an aqueous solution. It can also be used as a useful tool to differentiate between different types of gemstone, due to the unique chatoyance each individual stone displays.
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