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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Answer:
The correct answer is (d) concave as well as a convex mirror.
Explanation:
Concave mirror:
When a point source of light is incident at the focus of a concave mirror, the reflected rays will be parallel to the principal axis.
Convex mirror:
When a parallel beam of light is incident on a convex mirror, the reflected rays appear to be meeting at focus.
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