Three different arrangements of media are given through which light rays are being passed. If total internal reflection does not happen at any interface, then in which of the following will the emergent ray be parallel to the incident ray?
Case 2
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.