"When light is travelling in any medium, falls on the surface of a second medium, a portion of light is usually sent back into the first medium. This phenomenon is known as reflection."
The amount of reflected light depends upon the nature of reflecting surface. A smooth and polished surface reflects more light. If however, the reflecting surface is rough(unpolished) as in the case of a sheet of white paper or the walls of the room, then rays are reflected in all directions. This is known as diffused reflection. In practice a particular device, called mirror, used for reflection. A mirror is a device which reflects most of the light falling on it.
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