Index of Refraction Definition
The index of refraction of light in a particular medium is calculated with respect to another optical medium. For the sake of generalization, the commonly referred term "index of refraction" of a particular medium denotes the index of refraction of that medium calculated with respect to air/vacuum. This is more specifically known as the "absolute index of refraction" for a particular medium. We can calculate index of refraction by its definition: "Index of refraction can also be defined as the ratio of the speed of light in the first medium to the speed of light in the second medium".
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