One-way mirror , also called two-way mirror (or two-way mirror) and semi-transparent mirror , is a partially reflective reciprocal mirror and partially transparent. The perception of one-way transmission is achieved when one side of the mirror lights up and the other is dark. It allows viewing from the dark side but not vice versa.
Video One-way mirror
History
The first US patent for a one-way mirror appeared in 1903, then was given the name "transparent mirror".
Maps One-way mirror
Principle of operation
Glass is coated with, or has been wrapped inside, a thin and almost transparent metal layer (usually aluminum). The result is a mirror surface that reflects light and is penetrated by another. Light always passes both in both directions. However, when one side turns bright and the other remains dark, the darker side becomes hard to see from the bright side because it is covered by a much brighter reflection from the bright side.
Apps
The one-way mirror is usually used as a seemingly normal mirror in a brightly lit room, with a much darker room on the other side. People on the bright side see their own reflection - it looks like a normal mirror. People on the dark side see it - it looks like a transparent window. The light from the bright space reflected from the mirror back to the room itself is much larger than the light transmitted from the dark space, the abundance of small amounts of light transmitted from the dark to the bright spaces; instead, the light reflected back to the dark side is overwhelmed by the light transmitted from the bright side. This allows viewers on the dark side to observe the silent bright room.
When such mirrors are used for one-way observation, the watch room remains dark by dark curtains or double doors. This observation space has been used in:
- Execution room
- Experimental psychological research
- Interrogation room
- Market research
- The reality television, as in the Big Brother series, that uses many one-way mirrors throughout its set to allow cameramen in a special black aisle to use the camera to move to movie contestants without being seen.
- Security observation deck in public areas
- Train the driver or conductor compartment on a new metro train, such as the Movia rail family Movia at Bombardier Transportation, including Toronto Rocket
Smaller versions are sometimes used in:
- Low emissivity windows on vehicles and buildings
- Sheets of phone and tablet screens, allowing the screen to be used as a mirror when turned off
- Security camera, where the camera is hidden inside the mirror enclosure
- Stage effects (especially the Pepper ghost)
- Teleprompters, where they allow presenters to read from text projected onto the glass directly in front of a movie or television camera
- General settings of mirror illusion without borders
The same type of mirror, when used in an optical instrument, is called a beam breaker and works on the same principle as a mirrored particle.
See also
- Optical isolator
- Transparent graphics
- Film glass
References
External links
- Media associated with One-way mirror on Wikimedia Commons
Source of the article : Wikipedia
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