A technique has been developed for determining the ellipticity, (from which a circular dichroism plot can be made), of light emerging from a solution containing an optically active species, using a mica plate and a Rudolph spectropolarimeter. This technique has the advantage over previous procedures using a quarter-wave plate, in that precise orientation of the plate is not required. For of less than one radian, = (r coscos 2r)/sin , where is the retardation of the plate, r is the azimuth of the incident elliptical polarization, and y is the azimuth of the resultant polarization with respect to the fast axis of the mica.

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