Abstract
We investigate the use of Abbe-type refractometers with homogeneous absorbing fluids. We derive a simple model based on electromagnetic optics to describe quantitatively the angular distribution of light around the critical angle and report some experimental tests. First, we verify experimentally that the diffusing film near the base of the prism does in fact deliver light that refracts up to the critical angle. Then we compare experimental profiles of refracted light around the critical angle with theoretical profiles, and find very good agreement. Finally, we use the model to analyze some requirements and limitations on using Abbe-type refractometers on absorbing fluids.
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