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`

Text Solution

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The correct Answer is:

According to Snell's law, `musintheta=const ant`
Since AB is parallel to CD, `mu_1=mu_4`

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