In
optics, an
erect image is one that appears right-side up. An
image is formed when rays from a point on the original object meet again after passing through an optical system. In an erect image, directions are the same as those in the object, in contrast to an inverted image. It is one of the properties of images formed in a
plane mirror.
Some
telescopes and other devices such as the
camera obscura present an inverted image on the viewing surface.
and
compound prism elements can be used to achieve an erect image instead.
See also
