State whether concave lens has a real focus or a virtual focus.

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

With the help of a labeled diagram, explain how a concave lens diverges a beam of parallel light rays.

Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.

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.