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Homework Statement
Prove for effective index N that n1<N<n2.
Homework Equations
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N=n1sin(theta)
TIR is theta>thetacritical
snells law-n1sin(theta)=n2sin(theta2)
The Attempt at a Solution
I know why N is strictly less than n1 since sin(theta) goes from 0 to 1 and if its at 1 theta has to be 90. For TIR to actually happen N must be strictly less than n1. But I'm having trouble proving the n2<N part.