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

Answer:

c two plane mirrors at 90 degree

Explanation:

because beam of light fall on incident ray the two plane mirrors placed at 90 deree