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; http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html
(eq nu (/ c v))
(var nu "index of refraction")
(var c "velocity of light in vacuum")
(var v "velocity of light in the medium")
; Material examples for nu:
; Vacuum 1.000
; Air 1.000277
; Water 4/3
; Ice 1.31
; Crown glass 1.50 to 1.62
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