1. 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
Concave mirror as well as concave lens

Question

1.	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
Concave mirror as well as concave lens

Accepted Answer

Soln:

Answer is (a) Concave mirror as well as convex lens
Explanation:
Emergent beams are parallel and the image is produced at infinity when light rays from a point source are incident on a concave mirror and convex lens.

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