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I see... It is just that I have see somewhere that the C parameter has to be in m²... but it seems false ! Thanks for your help

By example, I should have : eta = 1.72 + (0.013 / 1000000²) / 0.500²

Thanks for your answer, But based on the formula here :http://en.wikipedia.org/wiki/Cauchy's_equation"]http://en.wikipedia.org/wiki/Cauchy's_equation[/PLAIN] the C parameters (I use B instead) is expressed in micro-meters ! So, if C = 0.013 in micro-meters I have to convert it to...

Hi everybody, I would like to use the 'cauchy dispersion formula', ie (http://en.wikipedia.org/wiki/Cauchy's_equation"]http://en.wikipedia.org/wiki/Cauchy's_equation):[/PLAIN] eta = A + B / w² Where : eta is the resulting IOR A is the base IOR B is the dispersion coefficient expressed...