A surface capable of reflecting sufficient undiffused light to form an image of an object placed in front of it is called mirror. In easy words An object that causes light or other radiation to be reflected from its surface, with little or no diffusion. Common mirrors which is used in everyday life consist of a thin sheet or film of metal, such as silver, behind or covering a glass pane. Mirrors are used extensively in homes, cars, telescopes, microscopes, lasers, fiber optics, measuring instruments, and many other devices.
Reflection is basically bouncing back of a light ray from a surface. Mirror provides the most common model for specular light reflection which are typically consists of a glass sheet with a metallic coating where the reflection actually occurs. Reflection is enhanced in metals by suppression of wave propagation beyond their skin depths.
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Examples reflection of light, sound and water waves etc.
The law of reflection says that When a light ray is incident upon a reflecting surface, the angle of reflection is equal to the angle of incidence. Mirrors exhibit specular reflection. Both of these angles are measured relative to a normal drawn to the surface. The incident ray, the reflected ray, and the normal all lie in the same plane.