NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Refraction.
From: Frank Reed CT
Date: 2004 Jul 9, 15:16 EDT
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
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
