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