The Collaborative International Dictionary
Optically positive
Optically \Op"tic*al*ly\, adv.
By optics or sight.
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With reference to optics.
Optically active, Optically inactive (Chem. Physics), terms used of certain isomeric substances which, while identical with each other in other respects, differ in this, viz., that they do or do not produce right-handed or left-handed circular polarization of light. See optical activity.
Optically positive, Optically negative. See under Refraction.