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glossary

Rigorous stigmatism: Property of certain optical systems for certain characteristic points of the object space such that all the rays coming from one of these points of the object space rigorously pass through a point of the image space (conjugate point) after transmission by the system optical
Mirror: surface reflecting light rays symmetrically regarding the normal to the surface (specular reflexion) and therefore without scattering them
Vertex: top of a surface
Back focal point: conjugate by an optical system of the on-axis point located at infinity