(a) What is a virtual image?
(b) When is a virtual formed? [3 MARKS]

(a) Definition: 1 Mark
(b) Explanation: 2 Marks

(a) The image that cannot be obtained on a screen is called a virtual image.

(b) A virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen.