Virtual image
[[Image:VirtualImage.png|thumb|256px|right| Top: The formation of a virtual image
using a concave lens. Bottom: The formation of a virtual image using a convex
mirror. In both diagrams, f is the focal point, O is the object and
I is the image, shown in grey. Solid blue lines indicate light rays.
It can be seen that the light rays appear to emanate from the virtual image
but do not actually exist at the position of the virtual image. Thus an image
cannot be formed by placing a screen at the position of the virtual image. Virtual image is a term used in optics and physics. It is a representation of an actual object (source) formed by diverging rays of light which seem to originate from the image, but in reality do not cross at that position. A screen or an observer placed where a virtual image appears to be cannot actually "see" it. For example, a plane or convex mirror forms a virtual image positioned behind the mirror. Although rays of light seem to come from behind the mirror, light from the source spreads and exists only in front of the mirror.
See also Real image
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