question_answer

A convex lens of focal length 10 cm is placed at a distance of 12 cm from a wall. How far from the lens an object be placed so as to form its real image on the wall?

A) The object should be placed at the distance of 30 m from the lens

B) The object should be placed at the distance of 60 m from the lens

C) The object should be placed at the distance of 20 m from the lens

D) The object should be placed at the distance of 40 m from the lens

E) None of these