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Appl Opt. 1988 Aug 15;27(16):3341-3. doi: 10.1364/AO.27.003341.

Refractive index of solutions at high concentrations.


The refractive index of liquid solutions at the He-Ne laser wavelength, 0.6328 microm, is presented. The measurements were carried out using the conventional minimum deviation method of an equilateral hollow glass prism. The refractive indices of sucrose, sodium chloride, glucose, and caster sugar solutions for a range of density varying from distilled water to a saturated condition were measured. The result shows that at higher concentrations a slight curvature can be seen from the plot of refractive index vs concentration of solution. However, the refractive index of sucrose shows a linear relationship with concentration. The accuracy of the measurements is estimated to be better than 0.3%.

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