A ray of light passes through four trans...

A ray of light passes through four transparent media with refractive indices`mu_1`,`mu_2`,`mu_3` and `mu_4` as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

`mu_(1) = mu_(2)`

`mu_(2) = mu_(3)`

`mu_(3)= mu_(4)`

`mu_(4) = mu_(10`

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