Specific Refraction
a parameter characterizing the electronic polarizability of a unit mass of a substance in the high-frequency electromagnetic field of a light wave. The specific refraction r of a substance is equal to the substance’s molecular refraction R divided by its molecular weight M. Specific refraction may be expressed in terms of a substance’s index of refraction n in several ways; the form most often used is
where ρ is the density of the substance.
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