This page is optimized for large screens. Zooming may cause some display problems.

glossary

Refraction: deviation of rays at the interface of two transparent media with different refraction indexes according to Snell-Descarte law
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 »
Vertex: top of a surface
Object: element (point, line, plane, or whatever,…) of the space linked to another element called image in a way that rays coming from the object and transmitted by an optical system focus on the image ; object and image are said to be conjugate by the optical system
Image: conjugate of an object by an optical system (see object)