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Question

# A ray of light passes through four transparent media with refractive indices μ1,μ2,μ3 & 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
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B
μ2=μ3
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C
μ3=μ4
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D
μ4=μ1
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Solution

## The correct option is D μ4=μ1Since, the light undergoes refraction from 3 transparent media, its speed and trajectory will only depend on the refractive indices of the respective medium.Since, the direction of the ray of light is same in the first and the fourth medium, the refractive indices of the 2 media have to be the same.So, μ1=μ4

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