Snell's Law - complex angle of refraction (need "complement")

einfall

Thanks for your tentative confirmation.

In what way would it depend on the intended use of that "complement"? Surely it's a geometrically well-defined complex number?

n.b. In every use of this "complement" θ (let's call it θ'), it's called as cos(θ') so the implicit infinity of periodic solutions is irrelevant.

einfall	Thanks for your tentative confirmation. In what way would it depend on the intended use of that "complement"? Surely it's a geometrically well-defined complex number? n.b. In every use of this "complement" θ (let's call it θ'), it's called as cos(θ') so the implicit infinity of periodic solutions is irrelevant.