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.

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?

Explain what is meant by a virtual, magnified image.

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?

Explain why, a real image can be projected on a screen but a virtual image cannot.