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glossary
Isotropic light source
: light source emitting with a constant intensity whichever the direction
Intensity ( radiometry )
: power emitted by a light source per unit of solid angle ; same term used in photometry
Aperture
: diaphragm limiting the number of light rays that are able to propagate
Optical system
: in geometrical optics, assembly of optical components for redirecting the light in a controlled manner
Transmission
: ratio between transmitted radiation power (or intensity or amplitude) and incident radiation power (or intensity or amplitude)
