List some things that concave lens and convex 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.

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

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.

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.