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.
... qualities which this singular mental constitution derived from his use of opium,—qualities which, although they did not increase, or even give direction to his meditative power, at least magnified it, both optically, as to its visual capacity, and creatively, as to its constructive faculty. These two conditions, each concurrent with the other in its ruling influence, impart to his life a degree of psychological interest which belongs to no other on record. Nor is this ... — Atlantic Monthly, Vol. XII. September, 1863, No. LXXI. - A Magazine Of Literature, Art, And Politics • Various
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