which of the following can form a parallel beam of light when light from a point source is incident on it?
a) concave mirror as well as convex lens
b) concave mirror as well as concave lens
c) convex mirror as well as convex lens
d) Two plane mirrors placed at 90 degree to each other
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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.
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