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- Thread starter Az83
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- #2

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A Google search on

air "refractive index"

led me here:

http://www.strw.leidenuniv.nl/~mathar/progs/prWaterWeb.html [Broken]

Calculates (n-1) depending on temperature, pressure, humidity, and even CO2 content of the atmosphere!

Do you happen to have a particular application or use in mind? Eg., ray tracing calculation, atmospheric distortion, solving a homework problem, other?

air "refractive index"

led me here:

http://www.strw.leidenuniv.nl/~mathar/progs/prWaterWeb.html [Broken]

Calculates (n-1) depending on temperature, pressure, humidity, and even CO2 content of the atmosphere!

Do you happen to have a particular application or use in mind? Eg., ray tracing calculation, atmospheric distortion, solving a homework problem, other?

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- #3

olgranpappy

Homework Helper

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well. I think you could look up the dielectric constant ([itex]\epsilon[/itex], where [itex]n^2=\epsilon[/itex]) at different densities. but also, if you know the dielectric constant at some given number density ([itex]n_1[/itex]) then to find it at a different density you could use

[tex]

\frac{\epsilon(n_2)-\epsilon(n_2)}{\epsilon(n_1)-1}=\frac{n_2-n_1}{n_1}

[/tex]

...and, sorry for using the symbol n for two different things... my bad, in the equation it is number density, not index of refraction

[tex]

\frac{\epsilon(n_2)-\epsilon(n_2)}{\epsilon(n_1)-1}=\frac{n_2-n_1}{n_1}

[/tex]

...and, sorry for using the symbol n for two different things... my bad, in the equation it is number density, not index of refraction

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- #5

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No, it will change with temperature and pressure. The denser the air, the higher the value.

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Is there an equation that relates the density to the index of refraction?

- #7

olgranpappy

Homework Helper

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i gave it to you

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Is there an equation that relates the density to the index of refraction?

You can do pretty well by assuming (n-1) is proportional to the air density.

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