The ratio of the velocity of light in a vacuum to that in a medium.
1 Let me assume that the index of refraction in air is 1.
2 The index of refraction of ebonite was found by Profs.
3 Well, that won't give you the depth, but it could give you the index of refraction .
4 You could also estimate the index of refraction by measuring the angular distance between the head and body.
5 Their minds had the same index of refraction , so that thoughts flashed back and forth between them effortlessly and without distortion.
6 Oh, let's say the index of refraction for water is 1.33 - that's important for the plot below.
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