The refractive index is dependent on temperature. As temperature increases the refractive index of the medium decreases. So is refractive index dependent on mass density?
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Also Correlation between the refractive index and the density – John Rennie Aug 18 '21 at 19:17
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It's often the case that denser materials have a higher refractive index, but it's not always true.
According to this website an exception is vegetable oil (n=1.47) and water (n=1.33), but oil floats on water so is less dense.
John Hunter
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