| Definition: | law stating that when a point on the retina is excited by a light stimulus that undergoes periodic variations in magnitude at a frequency that exceeds the critical flicker frequency, the visual perception produced is identical to that produced by a steady stimulus whose magnitude is equal to the mean magnitude of the variable stimulus taken over one period Note 1 to entry: This entry was numbered 845-02-51 in IEC 60050-845:1987.
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