When a pencil of ray, diverging from a point, after

reflection and refraction, actually passes through a second

point that second point is called the real image of the

first point.

When a pencil of rays after reflection; and refraction only

appear to pass through a point, the image is said to be virtual.

The difference between the two is that if a image can be

received upon a screen while a virtual image cannot be

received on a screen but can only be seen by the eye.