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

`n_1 = n_4`

`n_2 = n_4`

`n_3 = n_4`

`n_1 = (n_2 + n_3 + n_4)/(3)`

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