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 to each other
D. Concave mirror as well as concave lens
Answer:A
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 to each other D. Concave mirror as well as concave lens