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glossary
Mirror
: surface reflecting light rays symmetrically regarding the normal to the surface (specular reflexion) and therefore without scattering them
Effective focal length
: algebraic distance from the primary/secondary principal plane of an optical system to its front/back focal plane
Lens
: optical component with two refractive surfaces axially symmetrical for redirecting the light in a controlled manner
Vertex
: top of a surface
Equivalent mirror (catadioptric system)
: in Gauss approximation, single mirror behaving in the same way as the catadioptric system
