AbstractThe factor for the refraction correction was considered for the Fica 50 type of light scattering photometer, in which the scattered light is twice refracted before reaching the detector. The correction factor was first calculated after Hermans and Levinson, which elucidated that the factor is just the same as for the Brice type of photometer, and a vat liquid has no further effects on the final form of the correction factor. This result was examined and found to be practically applicable to a Fica 50 photometer by measuring the scattering intensities of several liquids and the RAPRA PS2 standard polystyrene in solvents of varying refractive index.