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When light is incident on a glass slab, ...

When light is incident on a glass slab, the incident ray, refracted ray and the emergent ray are in three media A, B and C. If `n_(1), n_(2)` and `n_(3)` are the refractive indices of A, B and C respectively and the emergent ray is parallel to the incident ray, which of the following is true ?

A

`n_(1) lt n_(2) lt n_(3)`

B

`n_(1) gt n_(2) gt n_(3)`

C

`n_(1) lt n_(2)=n_(3)`

D

`n_(1)=n_(3) lt n_(2)`

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