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For more than thirty years, rnvestrgators have recognized that luminescence measurements made with certam experimental geometries require corrections for the refractive index of the solution [I,?]. These corrections are necessary when the ratio of luminescence from two solutrons IS required, as in relatrve quantum yield measurements [3]. In many cases, the m~gnttude of these corrections is not smalI. The wtdely utilized “Ifrz2 correctron”, for example, amounts to more than 25% when comparing solutrons in benzene (n = 1.50) and water (n = 1.33). Recently there has been some discussion regarding the appropriateness of this correctron 14). In thrs paper, we extend the analysis of the index of refraction correctron, and show that a correction factor of i/n2 is approp~ate for common cxper~ment~ geometries.