A student performs an experiment with glass slab to trace the path of a ray of light entering from air into glass slab and emerging into air again. On looking carefully at the trace obtained on paper, he will observe that the emergent ray and the incident ray:
(1) are converging (coming closer to each other)
(2) are diverging (moving away from each other)
(3) are perpendicular (at right angles to each other)
(4) are parallel (at equidistant from each other)

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Solution

When a light ray enters a glass slab, it bends towards the normal. But when it emerges in the air again, it bends away from the normal and becomes parallel to the incident ray. So, the student will observe that the emergent ray and the incident ray are parallel.

Hence, the correct answer is option 4.

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