Question

what is the absolute refractive index of water

Answer 1

Temperature Degrees Celsius +/-0.01 Absolute Refractive Index of Water +/-0.00005 at 589.3 nm Refractive Index of Water relative to air at 589.3 nm
20 1.33334 1.33297
25 1.33285 1.33249
30 1.33228 1.33193

Answer 2

Here is your answer;

The absolute refractive index of water is 3/2.
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