Which of the following can make a parallel beam of light when light from a point source is incident on it?
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90 to each other
(d) Concave mirror as well as concave lens
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Convex mirror as well as concave lens
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Ans. (a) Concave mirror as well as convex lens
Explanation: When a point source of light is at the focus of a concave mirror or a convex lens, then emergent rays of light make a parallel beam of light. This is the reason; concave mirror is used as reflector of headlights.
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