Which of the following best describes the path of a light ray as it enters and then exits a glass slab from air?
Bends towards the normal, then away from the normal
When a light ray passes from a rarer medium (air) to a denser medium (glass), it bends towards the normal at the first surface because its speed decreases.
At the second surface, when it emerges back from the denser glass into the rarer air, it bends away from the normal because its speed increases again. The emergent ray is parallel to the incident ray but laterally shifted.
So the ray bends towards the normal on entry and away from the normal on exit.
Hence, Bends towards the normal, then away from the normal.
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