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## Main Question or Discussion Point

hello everyone

Consider extinction coefficient k, n becomes N=n-ik.

the text book says NsinA=N'sinB still holds itself.

But the sinB,for exmple, may be a complex number, i want to know

how to get B?

how to understand this situation, which is the refractive angle?

the B's real part?

Consider extinction coefficient k, n becomes N=n-ik.

the text book says NsinA=N'sinB still holds itself.

But the sinB,for exmple, may be a complex number, i want to know

how to get B?

how to understand this situation, which is the refractive angle?

the B's real part?