Question: Q. 2. The direction of ray of light incident on a concave mirror is shown by $P Q$ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Figure). Which of the four rays correctly shows the direction of reflected ray?

(a) 1. (b) 2 . (c) 3 . (d) 4. [NCERT Exemplar]

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Solution:

Ans. Correct option : (b)

Explanation : Incidence ray $P Q$ is coming through principal focus $F$ so it must be parallel to principal axis, that is, either 2 or 4 .

As it is a concave mirror so, ray cannot go behind the mirror so ray (4) is discarded.

So, ray 2 is the reflected ray.



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