(a) Explain why, a real image can be projected on a screen but a virtual image cannot. (b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly. (c) Name one simple optical instrument in which the above arrangement of convex lens is used.

Q.

(a) Explain what is meant by a virtual, magnified image. (b) Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly. (c) Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why ?

Q. Draw a ray diagram to show the formation of image by a convex lens when an object is placed in front of the lens between its optical centre and principal focus.

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 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) 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?