Posted by Amy on Tuesday, February 15, 2011 at 10:50pm.
You need experimental data on refractive index vs. salinity. Such data exists. See
http://www.ee.ucl.ac.uk/~mflanaga/java/Saline.html
for example
You also need an experimental measurement of the actual refractive index. This can be performed with a triangular prism containing the solution.
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