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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.
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