Abstract

Refractive indices of liquids were determined by measuring reflectance at a glass-liquid interface, measuring transmittance of the liquids, and calculating their relative refractive indices from a Fresnel reflection equation of Simon. The refractive index of the glass was measured independently and used to calculate n values of the liquids relative to vacuum. The spectral region investigated, 400–589 mμ, includes four absorption bands of β-carotene. Dispersion curves of two solution-solvent pairs were measured. The differences, Δnsolute=nsolutionnsolvent=f(λ), were compared with the predictions of quantum dispersion equations of Davydov.

© 1962 Optical Society of America

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