Question

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 1

As per the ray diagrams , we can conclude that :-
1) The rays which pass through the focus of a concave mirror will get parallel to each other and thus it can make the rays parallel from a point source

2) In the same way a convex lens can perform the same.

So the answer is option A.