The refractivity of light and its dispersion is a very simple physical property of a matter, but it has recently been taken up in our laboratory as a new index of detecting an apparently short range force of molecular interaction. This problem on the relation between the refractive index and the molecular structure has widely been developed and the conformation of a molecule has also been theoretically analyzed by the use of the method of rotatory dispersion.
The classic theory of photo-refractivity which was first theoretically elucidated by Maxwell on the velocity of electro-magnetic wave in a substance have aboundantly exhibited the nature of a bonded electron with related to the magnetic properties of a matter and have given the knowlege of atomic polarization which gives a degree of shift of electron in an atomic orbital.
The basic aim of this investigation is to re-examine the hypothesis on the dielecrtic constant of a poly-component mixture which was given by us as a law of the reciprocal additivity of the dielectric constants of the pure solvents. By using the wave of ultra-low frequency or a high frequency of 3 Mc/s order, the experiments for the mixture of nonpolar or the slightly polar substances showed good identities and these experimental results were already reported in the series of this investigation. In the case of very short wave-length as light, far different from that of relaxation time of the molecule in the mixture, the more good identity will be expected if the hypothesis is really correct.
Thus, in this paper, the results of experiments in proving the theoretical formula on the refractive index of a poly-component solvent mixture which was formulized from the theory of dielectric constant of the same mixture were exhibited and comparatively discussed with related to the other several formulae.
The materials used for these certifications were respectively as follows ; i) the mixture of Dioxane, Cyclohexane, n-Hexane, n-Heptane and Toluene, ii) the mixture of Toluene, Pyridine, Benzene, Monochlorobenzene and Dioxane, iii) the mixture of Cyclohexane, n-Heptane, n-Pentane, p-Xylene and n-Hexane, iv) the mixture of Benzene and Dioxane.