Rohit claims to have obtained an image twice the size of object with a concave lens. Is he correct?

Question

(i) Rohit claims to have obtained an image twice the size of object with a concave lens. Is he correct? Give reason for your answer.
(ii) Where should an object be placed in case of a convex lens to form an image of same size as of the object? Show with the help of ray diagram the position and the nature of the image formed.
(iii) With the help of ray diagram, illustrate the change in position, nature and size of the image formed if the convex lens in case of (ii) is replaced by concave lens of same focal length.

Answer 1

(i) No, Rohit is incorrect because magnified image of an object cannot be formed by a concave lens ever.

(ii) The object should be placed at 2f.

Image obtained is virtual, erect and diminished in case of concave lens.