a table of refractive indices and densities recorded for water with different amounts of sugar dissolved in it; once the solution is 2.5 molar, the refractive index is up to 1.4532 (and the density of the solute is 1.3162 g/cc). #refraction
in fact #refraction index is a standard way to measure the amount of sugar in a solution and you can get as high as 1.5
more indexes of #refraction of different quantities of sugar and other mixtures; sugar and propylene glycol can get the index as high as 1.3995, sugar in glycerol as high as 1.4735, ethanol in water as low as 0.7893. #pdf