Definition of Virtual image 1. Noun. A reflected optical image
(as seen in a plane mirror). Medical Definition of Virtual image
Such as seen in a mirror or through a magnifier. A virtual image
has no real existence in space as does a real image from a lens.
It does have a definite location, however, caused by the angles
of divergence of the rays received by the eye. This can be shown
by the common school experiment of placing a pin coincident with
its mirror image behind a sheet of glass acting as a partial
mirror. Its location can also be placed in design by
extrapolating backwards to a focus. If a magnifier is used as it
should be, with the object at its focus, the virtual image is at
infinity. The same is true for a microscope focused for the
relaxed eye. See: distance of virtual image. (05 Aug 1998)
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