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Relationship between density and refractive index of a medium

  1. Oct 25, 2011 #1
    What is the relationship (a mathematical one) between the density and the refractive index of a medium?
     
  2. jcsd
  3. Oct 25, 2011 #2
    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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