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Zurich Instruments AG - Lock-In Amplifiers 4/24 LB
Photonics Dictionary

optical axis

The imaginary line passing through both the centers of curvatures of the optical surfaces of a lens or mirror; the optical centerline for all the centers of an optical element(s) of an optical system. The optical axis is also the reference axis in which a particular degree of rotational symmetry is defined for an optical system. Not to be confused with optic axis

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