굴절률
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정의
매질의 굴절률(n)은 진공에서의 광속(c)과 해당 매질에서의 광속(v)의 비: n = c/v.
설명
Vacuum has n = 1 by definition; water is approximately 1.33, meaning light travels 33% slower in water than in vacuum. Diamond's high index of 2.42 causes the dramatic bending and internal reflection that gives cut diamonds their brilliance. Optical fiber uses the refractive index difference between core and cladding to confine light by total internal reflection.
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