In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens.
Answer: D
From ray diagrams we can see in Concave mirror, convex mirror, concave lens and convex lens the image of an object placed at infinity will be highly diminished and point sized.