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glossary
Lambertian light source : light source with a constant radiance (or luminance) whichever the direction
Multimode fiber optic : fiber optic enabling the propagation of several transverse modes
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
Transverse magnification : defines the algebraic ratio between the size of the image of an object by an optical system and the size of the object ; for centered optical systems, the transverse magnification is defined with objects in a plane perpendicular to the optical axis - transverse magnification is then positive if object and image have the same orientation and negative if they have opposit orientation
Core : central part of a fiber optic in which lightwaves are guided
Fiber optic : long cylindrical optical component guiding light
Numerical aperture ( fiber optics ) : dimensionless number characterizing the acceptance cone angle of an optical fiber
Clear aperture : aperture diameter of an optical system
Coupling efficiency ( fiber optics ) : ratio between the optical power emitted by a source and the optical power effectively injected in a fiber optics
