where n is the refractive index, ρ is the density of the substance, and k is a constant of proportionality.
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Abercrombie's First Law, also known as the "Abercrombie's Law," is a fundamental principle in physics that describes the relationship between the density of a substance and its refractive index. The law states that the refractive index of a substance is directly proportional to its density. Mathematically, this can be expressed as: