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A ray of light passes through four trans...

A ray of light passes through four transpar ent media with refractive indices`mu_(1),mu_(2), mu_(3)` and `mu_(4)` as shown in figure. The surfaces of all media are parallel. If the emergent ray is parallel to the incident ray, we must hav

A

`mu_(1)=mu_(2)`

B

`mu_(2)=mu_(3)`

C

`mu_(3)=mu_(4)`

D

`mu_(4)=mu_(1)`

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The correct Answer is:
D
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