Abstract
When immersion liquids are used to determine the refractive index (RI) of non-opaque solids, the dispersion staining method is a simple, effective and precise way to determine the matching wavelength, λ0, at which the RI of an immersion liquid equals that of the solid. A series of equations has been derived to calculate the RI at any given visible wavelength such as nF, nD and vie, i.e. the RI’s at Fraunhöfer spectral lines F (486 nm), D (589 nm), and C (656 nm), from λ0 data obtained by the dispersion staining method. Two methods have been established: the Single Liquid Method and the Double Liquid Method.The Single Liquid Method is applicable for solids with known dispersion coefficients, which is defined as (nF-nC). This method uses only one immersion liquid whose RI is close to the RI of the solid to be measured so that a match between the liquid and the solid occurs in the visible range.
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