An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens or microscope. The optical axis is an imaginary line that defines the path along which light propagates through the system. For a system composed of simple lenses and mirrors, the axis passes through the center of curvature of each surface, and coincides with the axis of rotational symmetry. The optical axis is often coincident with the system's mechanical axis, but not always, as in the case of off-axis optical systems. For an optical fiber, the optical axis is along the center of the fiber core, and is also known as the fiber axis.
Dictionary of Military and Associated Terms
In a lens element, the straight line which passes through the centers of curvature of the lens surfaces. In an optical system, the line formed by the coinciding principal axes of the series of optical elements.
The numerical value of optical axis in Chaldean Numerology is: 1
The numerical value of optical axis in Pythagorean Numerology is: 3
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"optical axis." Definitions.net. STANDS4 LLC, 2018. Web. 25 Feb. 2018. <https://www.definitions.net/definition/optical axis>.