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 from substances such as a mirror or water. The application of reflection mirrors is a coating on the optical glass to increase the reflection of the substrate. Coated reflection mirror is superior to a normal reflection mirror as the reflection of a normal reflection mirror is lower and would make ghosting as there is no selection of wavelength.
According to different shapes, reflection mirror can be divided into three species:
Plane reflection mirrors, spherical mirrors, and aspheric mirrors.