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glossary

Refraction index: for a transparent medium, ratio between the light speed in the air and the light speed in the medium ; for a reflective surface in the air or vacuum, the refraction index is « - 1 »
Dispersion ( refractive material ): measure relative to the dependance of the refractive index of a material on the wavelength
Constringence: parameter characterizing the chromatic dispersion of a material - the higher the constringence, the lower the dispersion