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A ray of light passes through four transparent media with refractive indices μ1, μ2, μ3 and μ4 as shown in the figure. 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

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Best answer

we must have 

(d) μ4 = μ1

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