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[tex]n=\sqrt{\epsilon_r \mu_r[/tex]

Refractive index for water is [tex]n=1,33[/tex]. For water [tex]\epsilon_r=81, \mu_r=1[/tex] so it should be

[tex]n=9[/tex]

Why we have so big anomaly for water?

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# Refractive index and Maxwell theory

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