A virtual image is formed by a plane mirror. The rays reflecting from the mirror appear to have originated from the location of the virtual image. On a diagram, a real image is usually depicted by a solid arrow. The image in a plane mirror is located as far behind the mirror as the object forming it is in front of the mirror. It is the same size as the object.
R is the radius of curvature and f is the focal length.
The image formed in a plane mirror is erect but laterally inverted . Ray diagrams are an important aid used in geometric optics. A ray diagram is used to trace the path of rays through an optical system. A ray diagram and terminology for reflection Ray diagrams should always be labelled properly. They should also be drawn neatly, accurately, and to some appropriate scale.