Relationship between density and refractive index of a medium

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The refractive index (n) of a medium is mathematically related to its density (ρ), specifically, the difference (n-1) is proportional to ρ. However, calculating the refractive index involves more factors than just density, as various material properties and the wavelength of light also play significant roles. The relationship indicates that as density increases, the refractive index typically increases as well. This complexity highlights the need for a comprehensive understanding of material composition and light interaction. Overall, while density influences refractive index, it is not the sole determinant.
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What is the relationship (a mathematical one) between the density and the refractive index of a medium?
 
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Thinker8921 said:
What is the relationship (a mathematical one) between the density and the refractive index of a medium?

For a given composition of material, the index n at a given wavelength is proportional to density ρ - actually the difference (n-1) is proportional to ρ, since n can be less than 1. But there's a LOT more to calculating the refractive index of a given material at a given wavelength than just it's density.
 

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