a) How many reflected rays can be obtained from a single incident ray of a plane mirror? b) Why is concave mirror used in search light and headlights?
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Answer(a)
Every reflected ray has a unique incident ray. Therefore, total number of incident rays is equal to total number of reflected rays. Hence, there will be only one reflected ray for one incident ray.
Answer(b)
Concave mirror are used in car headlamp. Concave mirror has converging power, it can concentrate the light ray at a particular point. And in night we want highly concentrated light beam for clear visibility. This is why concave mirror is used.
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