Choose the position of object, kept before a lens to form image of same size as that of the object.
concave lens, at 2F1
convex lens, at 2F1
concave lens, at F1
convex lens, at F1
Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed : (a) at 2F1, (b) between F1 and the optical centre O of the lens. Which of the above two cases shows the use of the convex lens as a magnifying glass ? Give reasons for your choice.