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The stress‐optic coefficients or Brewster constants C'λ001 and C'λ110 of mixed crystals of KClKBr are measured in the wavelength range 3000 to 6200 Å using a modified Filon method. The percentage dispersion of C'λ001 and C'λ110 increases with increasing KBr content, reaches a maximum around equimolar concentration, and finally falls off to the value of pure KBr. Also, at a given wavelength, the C'λ vary nonlinearly with the composition of the mixture, the deviation being larger in the ultraviolet.

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