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A ray of light passes through four trans...

A ray of light passes through four transparent media with refractive index `n_(1) ,n_(2),n_(3) and n_(4)` as shown, the surface of all media are parallel If the emergent ray DE is parallel to incident ray AB, then

A

`n_(1) = n_(4)`

B

`n_(2) = n_(4)`

C

`n_(3) = n_(4)`

D

`n_(1) = (n_(2) + n_(3) + n_(4))/(3)`

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The correct Answer is:
A
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