Question

A) Starting with n1 Sin i = n2 Sin r, show that the value of i...

A) Starting with n1 Sin i = n2 Sin r, show that the value of i when r = 90 degrees is given by sin-1(n2 / n1). This value of i is usually designated as ic, the angle for total internal reflection.

B) For what condition on n1 and n2 does this expression make sense?

I know how to solve for A, but I'm lost on part B, can you please show me how we find the condition and the reasoning behind it?

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