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optic axis

   Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Wikipedia, Hutchinson 0.03 sec.
optic axis [′äp·tik ′ak·səs]
(optics)
The axis in a doubly refracting medium in which the ordinary and extraordinary waves propagate with the same velocity, and double refraction vanishes. Also known as optical axis; principal axis.


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Spherical Aberrations result from the fact that focal points of light rays far from the optic axis of a spherical lens are different from the focal points of rays of the same wavelength passing near the center.
 
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