When light is totally polarized by reflection at an interface between two materials where the index of refraction for the incident medium is n1 and for the other is n2, the incident angle is given by 
= tan-1(n2/n1). This equation holds
A. only when n2 > n1.
B. only when n1> n2.
C. only when n2> n1+ 1.
D. only when n2< n1+ 1.
E. for all values of n1 and n2
E. for all values of n1 and n2
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