Abstract
An equation describing the effect of temperature on the isothermal piezo-optic coefficient under normal pressure has been established for water, at 5893 AA wavelength and for temperatures below 65 degrees C. This (along with other optical data) allowed the author to test various refringency laws. It is shown that the so-called 'invariants of refraction' given in literature are not satisfactory. The theoretical formula given by Lucas (1974) leads to results that disagree with the experimental data. The semi-empirical formula of Eisenberg (1965) only give correct values for the refractive index and thermo-optical coefficient of water; in the case of the piezo-optic coefficient there is, however, a discrepancy with reference values at the highest temperatures.
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