Cauchy's equation

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What Wikipedia says

In optics, Cauchy's transmission equation is an empirical relationship between the refractive index and wavelength of light for a particular transparent material. It is named for the mathematician Augustin-Louis Cauchy, who originally defined it in 1830 in his article "The refraction and reflection of light".

Excerpt from the Wikipedia article “Cauchy's equation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dispersion_-_Sellmeier_vs_Cauchy_modell_DE.svg: en:user:DrBob derivative work: Tizeff (talk), CC BY-SA 3.0, via Wikimedia Commons.