(a) Where will the image be formed if an object is kept in front of concave lens at a [3] distance equal to its focal length? Draw a neat labeled ray diagram to illustrate your answer.
(b) An object of height 4 cm is placed at a distance of 24 cm in front of a convex lens of focal length 8 cm.
     (i) Find the position and size of the image.
     (ii) State the characteristics of he image.
(c) In the ray diagram given below, PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS and NN' is the normal at the point Q.