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The figure shows total internal reflection taking place in three materials of refractive indices n1,n2 and n3 where θc1,θc2,θc3 are critical angles in the respective mediums. Then

 

 

(a)n1>n2>n3(b)n3<n1<n2(c)n1<n2<n3(d)n2<n1<n3

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