In the following figures, identify the light ray that would be the correct emergent/refracted light ray in each case. Give reason for your answer in each case.
In case of Fig (a), P is the emergent ray because when a ray of light passes through a glass slab then it bends downwards.
In case of Fig (b), R is the emergent ray because light ray bends towards the normal when it enters a denser medium from a rarer medium.
In case of Fig (c), R is the emergent ray because light ray bends away from the normal when it enters a rarer medium from a denser medium.