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.

List some things that concave lens and convex mirror have in common.

Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:

(a) At 2F₁

(b) Between F1 and the optical centre 0 of the lens.

Which of the above two cases shows the use of convex lens as a magnifying glass? Give reasons for your choice.

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.