(a) Name the lens which always forms an erect and virtual image.

(b) State whether the image in part (a) is magnified or diminished?

Can a concave lens form an image of size two times that of the object? Give reason?

Give two characteristics of the virtual image formed by a convex lens.

Complete the following sentences —

(a) An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ……………

(b) An object is placed at a distance 2f from a convex lens of focal length f. The size of the image formed is …………… that of the object.

(c) An object is placed at a distance 5 cm from a convex lens of focal length 10 cm. The image formed is virtual, upright and ……………