A magnifying glass is a convex lens which produces a magnified (larger) image of an object.
A magnifying glass produces an upright, magnified virtual image. The virtual image produced is on the same side of the lens as the object.
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.