(a) An object is placed between f and 2f in front of a convex lens. Draw a labelled ray-diagram to show the formation of image.
(b) State whether the image formed is real or virtual.
​(c) State whether the image formed is diminished or enlarged.

Q. (a) For which position of an object, a real, diminished image is formed by a convex lens?
(b) Two convex lenses A and B have focal lengths of 2.5 cm and 12.0 cm, respectively. Which lens has a greater power?
​(c) Describe with the help of a labelled ray-diagram, the formation of image when an object is placed in the front of a convex lens between focus and optical centre. State any two characteristics of the image formed.

Q. (a) An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.
(b) What is the effect on the size and position of the image of moving the object (i) towards the lens, and (ii) away from the lens?

Q. A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens. Draw a ray diagram to show the image formation.