is: a representation of an object. [P6.2, P6.3]
is produced: by reflection at a mirror surface, or refraction at an interface between transparent media or at a combination of interfaces such as a lens or some other optical system. [P6.2, P6.3]
arises: when light rays leaving a point on the object are brought back together (real image) or appear to be brought back together (virtual image) to a common point. [P6.2, P6.3]
can be seen: either as a point image or an extended image. [P6.2, P6.3]
Copyright 1997, The Open University