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optical rotation The change in the angle of transmitted plane-polarized light as it passes through a solution of a chiral sample, such that the change is proportional to the concentration of the chiral molecule and to the length of the light path through the solution. In dextro-rotation the change is clockwise when facing the light source; in laevo-rotation the change is counterclockwise. (see also circular dichroism (CD); optical rotatory dispersion (ORD))

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