Which of the following can make a parallel beam of light when light from a point source is incident on it?

Q. 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

Answer: Concave mirror as well as convex lens