Three different arrangements of media are given through which light rays are being passed. If total internal reflection is not happening at any interface, In which of the following will the emergent ray be parallel to the incident ray?

None of these

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Solution

The correct option is D
In all the cases, the emergent ray will be parallel to the incident ray due to the fact that, If total internal reflection is not happening at any interface, The path of the emergent ray will be parallel to the path originally followed by the incident ray.

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