Just to remind myself, here is a list of important IOR used in CG:
Some representative refractive indicesMaterial
Vacuum 1 (exactly)
Air at STP 1.0002926
carbon dioxide 1.00045
Crown glass 1.52
water ice 1.31
liquid water (20°C) 1.333
rock salt 1.516
salt (NaCl) 1.544
polycarbonate 1.59
glass (typical) 1.5 to 1.9
diamond 2.419
silicon 4.01
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