Definitions for optical axis
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Dictionary of Military and Associated Terms
optical axis
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.
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"optical axis." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/optical axis>.