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glossary

Angle of incidence: angle of a light ray incident on a surface with the normal to the surface
Angle of refraction: angle of a light ray refracted by a surface with the normal to the surface
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 »
Refraction: deviation of rays at the interface of two transparent media with different refraction indexes according to Snell-Descarte law