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m v2.05b - Bot T20 CW#61 - Fix errors for CW project (Reference before punctuation - Link equal to linktext) |
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<math display="block">\underline{n} = n - i\kappa.</math>
The real and imaginary part of this refractive index are not independent, and are connected through the [[Kramers–Kronig relations]], i.e. the complex refractive index is a [[linear response function]], ensuring causality. Here, the real part {{mvar|n}} is the refractive index and indicates the [[phase velocity]], while the imaginary part {{mvar|κ}} is called the '''extinction coefficient'''<ref name=DresselhausMITCourse>{{cite web
|url = http://web.mit.edu/course/6/6.732/www/6.732-pt2.pdf
|title = Solid State Physics Part II Optical Properties of Solids
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