question_answer 62)

  Draw ray diagrams showing the image formation by a convex lens when an object is placed (a) between optical centre and focus of the lens (b) between focus and twice the focal length of the lens (c) at twice the focal length of the lens at infinity (d) at the focus of the lens

Answer:

                  (A) The enlarged, virtual and erect image forms beyond 2F1, in the same side of object when the object is placed between optical centre and focus F1 of the lens. (b) The enlarged, real and inverted image forms beyond focus 2F2 on the other side of the object when the object is placed between focus F1 and twice the focal length of the lens. (c) The real and inverted image of equal to the size of object forms at focus 2F2 on the other side of the object when the object is placed at twice the focal length of the lens. (d) The real, inverted and highly reduced image forms at focus F2 on the other side of the object when the object is placed at infinity. (e) The real, inverted and highly magnified image forms at infinity on the other side of the object when the object is placed at the focus of the lens.