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_(1)`

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The correct Answer is:

For successive refraction through different media `mu sin theta=` constant. Here as `theta` is same in two extreme media `, mu_(1)=mu_(2)`

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