This page is optimized for large screens. Zooming may cause some display problems.
glossary
Mirror: surface reflecting light rays symmetrically regarding the normal to the surface (specular reflexion) and therefore without scattering them
Clear aperture: aperture diameter of an optical system
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 »
Schmidt plate: refractive plate perpendicular to the optical axis compensating the spherical aberration of a spherical mirror when the object is at infinity