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What is the relation between refractive index and density?

Ritz , 8 Years ago
Grade 12
anser 2 Answers
Sachin Tiwari

Last Activity: 8 Years ago

(n-1)/d=constant.
Where,n=refractive index.
             d=density.       . …       …..............
But it is true only for a  certain type of materials..   Abd in geberal it can’t true..
.eg:-oil less dense than water, yet more optically refractive. 
 
Sachin Tiwari

Last Activity: 8 Years ago

Refractive index is roughly proportional to the square root of the products of medium electrical and magnetic polarizability (e.g., permittivity and permeability). Refractive index increasing with density, mass/volume, is a red herring poorly coupled to increased polarizability of heavy elements.
 
Sulfur (rhombohedral):
d = 2.07 g/cm^3
nD = 1.957
 
Bromine:
d = 3.119 g/cm^3
nD = 1.661
 
Calcium fluoride:
d = 3.180 g/cm^3
nD = 1.434
 
Benzene:
d = 0.874
nD = 1.501
 
Hexadeuterobenzene:
d = 0.95 g/cm^3
nD = 1.497
 
Hexafluorobenzene:
d = 1.612 g/cm^3
nD = 1.332 
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