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complex refractive index
complex value where the real part is the refractive index and the imaginary part is related to the spectral absorption index 
where 
.
Note 1 to entry: The complex refractive index has unit one.
Note 2 to entry: This entry was numbered 845-04-103 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-242 in CIE S 017:2011.