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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

A

`mu_(1) = mu_(2)`

B

`mu_(2) = mu_(3)`

C

`mu_(3) = mu_(4)`

D

`mu_(4) = mu_(1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Applying Snell's law at B and C ,

`mu "sin"1 ` = constant or `mu_(1) "sin" I_(B)= mu_(4) "sin" i_(C)`
But `AB || CD therefore i_(B) = i_(C) "or" mu_(1) = mu_(4)`
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