01 adv. By optics or sight.
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1.
By optics or sight.
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2.
With reference to optics.
Phrases & compounds
Optically active —
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 —
See under Refraction.