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refraction, <of electromagnetic waves>
process by which the direction of propagation of an electromagnetic wave is changed as a result of changes in its velocity of propagation in passing through an optically non-homogeneous medium, or in crossing a surface separating media with different refractive indexes
Note 1 to entry: This entry was numbered 845-04-100 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-1073 in CIE S 017:2011.