Mirror image

A mirror image (in a plane mirror) is a reflected duplication of an object that appears almost identical, but is reversed in the direction perpendicular to the mirror surface. As an optical effect it results from reflection off of substances such as a mirror or water. It is also a concept in geometry and can be used as a conceptualization process for 3-D structures.

In geometry and geometrical optics

In two dimensions

In geometry, the mirror image of an object or two-dimensional figure is the virtual image formed by reflection in a plane mirror; it is of the same size as the original object, yet different, unless the object or figure has reflection symmetry (also known as a P-symmetry).

Two-dimensional mirror images can be seen in the reflections of mirrors or other reflecting surfaces, or on a printed surface seen inside out.

If we look at an object that is effectively two-dimensional (such as writing) and then turn it towards a mirror, the object turns through an angle of 180 degrees and we see a left-right reversal in the mirror. In this example, it is the change in orientation rather than the mirror itself that causes the observed reversal. Another example is when we stand with our backs to the mirror and face an object that's in front of the mirror. Then we compare the object with its reflection by turning ourselves 180 degrees, towards the mirror. Again we perceive a left-right reversal due to a change in orientation. So, in these examples the mirror does not actually cause the observed reversals.

Mirror image (disambiguation)

Mirror image is an optical effect.

Mirror Image may also refer to:

Mirror Image (Joey Pearson album)

Mirror Image is the third album from singer Joey Pearson.

Track listing