This page is optimized for large screens. Zooming may cause some display problems.
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
- F-number: dimensionless number whose inverse value is twice the numerical aperture of an optical system ; for optical systems designed to « work » at infinity, it is commonly assumed as the ratio between the focal length and the aperture diameter
- 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