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glossary
- Lambertian light source: light source with a constant radiance (or luminance) whichever the direction
- Radiance ( radiometry ): for a light source or a diffusing/reflecting surface, power emitted per unit of solid angle and per unit of apparent area
- Aperture : diaphragm limiting the number of light rays that are able to propagate
- Effective focal length: algebraic distance from the primary/secondary principal plane of an optical system to its front/back focal plane
- Transmission: ratio between transmitted radiation power (or intensity or amplitude) and incident radiation power (or intensity or amplitude)
- Irradiance ( radiometry ): optical power received by unit area
- Optical system: in geometrical optics, assembly of optical components for redirecting the light in a controlled manner
- Back focal plane: plane conjugate by an optical system of an object plane perpendicular to the optical axis and located at infinity