• Device for reflecting light or other radiation. Curved mirrors can be made to form images, a principle exploited by Newton to create the first reflecting telescope and which is now applied in the construction of all large telescopes. Since his time, the ability to grind large mirrors accurately to within a small fraction of the wavelength of light has increased, and with it the ability to make large mirrors of use in astronomy. There is controversy over whether to make larger single mirrors for major telescopes or to concentrate on multiple-mirror types where the light from a number of smaller mirrors is added together.
  • A surface that reflects light. Such a surface is usually smooth, highly polished, and it may consist, for instance, of a thin layer of silver or aluminum on glass. Mirrors have many applications, including their use in lasers, beam splitters, microscopes, TV cameras, and digital mi-cromirror devices. Also called reflector (2).
  • To duplicate, replicate, or reflect, as accomplished, for instance, by a current mirror or an electromagnetic mirror.

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