A technique based on well-known interferometric procedures is described for determining the corrections for phase-change dispersion at reflection in Fabry-Perot interferometers. Results obtained during precise determinations of mercury-198 waveengths are quoted to illustrate its application. A marked difference is found between the dispersion corrections for the silvered and aluminized mirrors actually used, and it is established that the latter have negligible corrections in the region 4047 A. to 6438 A.
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Barrell et al. (1951) studied this question.
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