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A ray of light passes through four trans...

A ray of light passes through four transparent media wit refractive index `n_1, n_2, n_3 and n_4` as shown. The surfaces of all media are paralleld

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 = frac(n_2 + n_3 + n_4)(3)`

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