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Questions  

A ray of light through four transparent media with refractive indices μ1, μ2,  μ3, and μ4,  is shown in fig. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

a
μ1 =μ2
b
μ2 =μ3
c
μ3 =μ4
d
μ4 =μ1

detailed solution

Correct option is D

If incident and final refracted beams are parallel then  μ1 = μ4

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