The document discusses reflection of light off mirrors and how images are formed by plane mirrors. It defines key terms like incident ray, reflected ray, normal, angle of incidence, angle of reflection. It explains that the angle of incidence equals the angle of reflection. Images formed in mirrors are virtual, meaning they cannot be projected but appear behind the mirror. The position of the image is the same distance behind the mirror as the object is in front of it. Examples and questions are provided to illustrate these concepts.