question_answer 50)

  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) The incident rays which comes from an object placed at infinity will be parallel and the rays parallel to the principal axis, after reflection/refraction by concave mirror, convex mirror, concave lens and convex lens, will pass or appear to pass through the principal focus . Hence, image will be highly diminished and point sized.