This document discusses the properties and characteristics of plane mirrors and concave mirrors. It defines a plane mirror as a transparent object that reflects light off its flat surface. It then discusses the virtual, upright image formed by a plane mirror. The document goes on to define a concave mirror as having a spherical reflecting surface curved inwards. It labels the focal point, focal length, vertex, radius of curvature and describes the three principle rays. The document concludes by explaining the different types of images (real, virtual, upright, inverted) formed by a concave mirror depending on the object's position relative to the focal point and radius of curvature.