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A real image ... is an image which is located in the plane of convergence for the light rays that originate from a given object.
In ray diagrams ... real rays of light are always represented by full, solid lines; perceived or extrapolated rays of light are represented by dashed lines.
A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to diverge.
In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.