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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