Everything about Perfect Mirror totally explained
A
perfect mirror is a theoretical
mirror that reflects
light (and
electromagnetic radiation in general) perfectly, and doesn't transmit or absorb it.
Domestic mirrors are not perfect mirrors as they
absorb a significant portion of the
light which falls on them.
Dielectric mirrors are
glass or other substrates on which one or more layers of dielectric material are deposited, to form an
optical coating. A very complex dielectric mirror can reflect up to 99.999% of the light incident upon it, for a narrow range of
wavelengths and angles. A simpler mirror may reflect 99.9% of the light, but may cover a broader range of wavelengths.
Almost any dielectric material can act as a perfect mirror through
total internal reflection. This effect only occurs at shallow angles, however, and only for light inside the material. The effect happens when light goes from a medium with a higher
index of refraction to one with a lower value (like air).
A new type of "perfect mirror", developed in 1998 by researchers at MIT
(External Link
), is a hybrid made of thin films of metals and dielectrics. These unusual mirrors are very efficient reflectors over a broad range of angles and wavelengths, and are insensitive to
polarization.
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