Secondary axis

(Opt.)

any line which passes through the optical center of a lens but not through the centers of curvature, or, in the case of a mirror, which passes through the center of curvature but not through the center of the mirror.

secondary axis

sec·on·dar·y ax·is

any ray passing through the optic center of a lens.

sec·on·dar·y ax·is

(sek'ŏn-dar-ē ak'sis) Any ray passing through the optic center of a lens.

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