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.The process of returning (or bouncing back) the light to the same medium after striking a surface is called reflection of light.
A surface which reflects the light is known as a reflector. Objects can be seen by the light they emit, or, more often, by the light they reflect. Reflected light obeys the law of reflection, that the angle of reflection equals the angle of incidence. Throwing back or deflection of waves, such as light or sound waves, when they hit a surface. Reflection occurs whenever light falls on an object. The law of reflection states that the angle of incidence (the angle between the ray and a perpendicular line drawn to the surface) is equal to the angle of reflection (the angle between the reflected ray and a perpendicular to the surface).
Light reflected from a surface can be either regular (plane), where the surface is flat and smooth and light rays are reflected without any scattering; or scattered, where the surface is irregular (in effect, many different surfaces). The colour of the sky is due to scattering of sunlight by particles in the atmosphere, such as dust and gas particles, water droplets, or ice crystals. On a clear day the sky appears blue due to the scattering of shorter wavelength light.
The polished metal surfaces are good reflector. However, silver metal is the best reflector.