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    Re: Refraction.
    From: Frank Reed CT
    Date: 2004 Jul 9, 15:16 EDT
    "Implicit in this statement is the assumption that the relationship between the increase in density and the increase in the index of refraction is linear.  Can you give me a reference about this?
    I believe that a correllation is there, but if the functional form is linear, then is the constant of proportionality exactly 1.0? If it is non-linear, then what is the functional form?"

    Off the top of my head, I don't know where you would find a reference on this. It's standard for low to moderate density gases. The index of refraction is very nearly given by
       n = 1 + 0.0003*(rho/rho_0)
    where rho is the variable density and rho_0 is the sea level density under standard conditions. Note that this relationship does not apply to liquids or solids or very high-density gases.

    Frank R
    [ ] Mystic, Connecticut
    [X] Chicago, Illinois
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