EoR=|(n1-n2/n1+n2)|EoI
For EoI to be zero
n2=n1.
If n2=1 all three materials will be same and so there wont be any reflection.
If we take n2=5 there will be some reflection from first interface itself.
So the required answer is n2=1.
Consider this problem thinking that light comes with 90 degree angle What should be the thinkness...
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