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
- Optical system: in geometrical optics, assembly of optical components for redirecting the light in a controlled manner
- Aperture : diaphragm limiting the number of light rays that are able to propagate
- Transmission: ratio between transmitted radiation power (or intensity or amplitude) and incident radiation power (or intensity or amplitude)