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That a real image can exist in space even without a surface for the imageto
be realized on can be demonstrated in several ways. One is to darken
a room, project a slide into space (i.e., no screen at the location
of the image, and then rapidly move a broomstick across the light
beam at the point where the image should be. The viewers will see the
image appearing on the broomstick, and because of the persistence of
vision, it will appear to be an entire picture.