These rays are reflected at an equal yet opposite angle from which they strike the mirror (incident light). The light can also be pictured as rays (imaginary lines radiating from the light source, that are always perpendicular to the waves). This allows the waves to form an image when they are focused through a lens, just as if the waves had originated from the direction of the mirror. Light consists of waves, and when light waves reflect off the flat surface of a mirror, those waves retain the same degree of curvature and vergence, in an equal yet opposite direction, as the original waves. In modern mirrors, metals like silver or aluminum are often used due to their high reflectivity, applied as a thin coating on glass because of its naturally smooth and very hard surface.Ī mirror is a wave reflector. Natural mirrors have existed since prehistoric times, such as the surface of water, but people have been manufacturing mirrors out of a variety of materials for thousands of years, like stone, metals, and glass. This allows the viewer to see themselves or objects behind them, or even objects that are at an angle from them but out of their field of view, such as around a corner. Mirrors reverse the direction of the image in an equal yet opposite angle from which the light shines upon it. Light that bounces off a mirror will show an image of whatever is in front of it, when focused through the lens of the eye or a camera.
The mirror magnified the sound of approaching enemy Zeppelins for a microphone placed at the focal point.Ī mirror is an object that reflects an image. 4.5-metre (15 ft) high acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from World War I.
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