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Optic axis of a crystal
optic chiasm
optic chiasma
optic cup
optic disc
optic disk
optic lobe
optic nerve
optic radiation
optic thalamus
optic tract
optic vesicle
optical aberration
optical art
optical axis
optical bench
Optical circle
optical condenser
optical crown
optical crown glass
optical cube
optical density
optical device
optical disc
optical disk
optical fiber
optical fibre
optical flint

optical activity definitions

Merriam Webster's

noun Date: 1877 ability of a chemical substance to rotate the plane of vibration of polarized light to the right or left

Britannica Concise

Ability of a substance to rotate the plane of polarization of a beam of light passed through it, either as crystals or in solution. Clockwise rotation as one faces the light source is "positive," counterclockwise rotation "negative." L. Pasteur was the first to recognize that molecules with optical activity are stereoisomers (see isomerization). Optical isomers occur in mirror-image pairs whose physical and chemical properties are the same except that they rotate the plane of polarized light in opposite directions and interact differently with other stereoisomers (see asymmetric synthesis).


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