"Two-way mirror" redirects here. For the Crystal Antlers album, see One-Way Mirror. For the Gabbie Hanna EP, see 2WayMirror.
A One-way mirror, also called Two-way mirror[1] (or one-way glass, half-silvered mirror, and semi-transparent mirror), is a reciprocalmirror that appears reflective on one side and transparent at the other. The perception of one-way transmission is achieved when one side of the mirror is brightly lit and the other side is dark. This allows viewing from the darkened side but not vice versa.
The first US patent for a one-way mirror appeared in 1903, then named a "transparent mirror".[2][3]
Principle of operationedit
Principle of operation of a one-way mirror showing that both parties predominantly see the person on the bright sideThe optical properties of the mirror can be tuned by changing the thickness of the reflecting layer.
The glass is coated with, or has been encased within, a thin and almost-transparent layer of metal (window film usually containing aluminium). The result is a mirrored surface that reflects some light and is penetrated by the rest. Light always passes equally in both directions. However, when one side is brightly lit and the other kept dark, the darker side becomes difficult to see from the brightly lit side because it is masked by the much brighter reflection of the lit side.[4]
A one-way mirror is typically used as an apparently normal mirror in a brightly lit room, with a much darker room on the other side. People on the brightly lit side see their own reflection—it looks like a normal mirror. People on the dark side see through it—it looks like a transparent window. The light from the bright room reflected from the mirror back into the room itself is much greater than the light transmitted from the dark room, overwhelming the small amount of light transmitted from the dark to the bright room; conversely, the light reflected back into the dark side is overwhelmed by the light transmitted from the bright side. This allows a viewer in the dark side to observe the bright room covertly.
When such mirrors are used for one-way observation, the viewing room is kept dark by a darkened curtain or a double door vestibule. These observation rooms have been used in:
Reality television, as in the series Big Brother, which makes extensive use of one-way mirrors throughout its set to allow cameramen in special black hallways to use movable cameras to film contestants without being seen.[5]
^"How to Spot a Two-Way Mirror". Snopes. Retrieved 28 March 2020.
^"The History of Mirrors". About.com. Archived from the original on 22 April 2015. Retrieved 22 April 2015.
^US patent 720877, Emil Bloch, "one way mirror", published 17 February 1903, assigned to Emil Bloch
^Finio, Ben. "Arduino-controlled RGB LED Infinity Mirror". Instructables. Autodesk, Inc. Retrieved 12 August 2017.
^"Tour the Big Brother house camera runs". bbspy.co.uk. 28 September 2013. Retrieved 6 March 2014.
External linksedit
Media related to One-way mirror at Wikimedia Commons
March 13, 2024
mirror, mirror, redirects, here, crystal, antlers, album, mirror, gabbie, hanna, 2waymirror, also, called, mirror, glass, half, silvered, mirror, semi, transparent, mirror, reciprocal, mirror, that, appears, reflective, side, transparent, other, perception, tr. Two way mirror redirects here For the Crystal Antlers album see One Way Mirror For the Gabbie Hanna EP see 2WayMirror A One way mirror also called Two way mirror 1 or one way glass half silvered mirror and semi transparent mirror is a reciprocal mirror that appears reflective on one side and transparent at the other The perception of one way transmission is achieved when one side of the mirror is brightly lit and the other side is dark This allows viewing from the darkened side but not vice versa One way mirrors for upper level observation deck viewing down into a classroom University of Wisconsin Eau Claire Contents 1 History 2 Principle of operation 3 Applications 4 See also 5 References 6 External linksHistory editThe first US patent for a one way mirror appeared in 1903 then named a transparent mirror 2 3 Principle of operation edit nbsp Principle of operation of a one way mirror showing that both parties predominantly see the person on the bright side nbsp The optical properties of the mirror can be tuned by changing the thickness of the reflecting layer The glass is coated with or has been encased within a thin and almost transparent layer of metal window film usually containing aluminium The result is a mirrored surface that reflects some light and is penetrated by the rest Light always passes equally in both directions However when one side is brightly lit and the other kept dark the darker side becomes difficult to see from the brightly lit side because it is masked by the much brighter reflection of the lit side 4 Applications edit nbsp One way glass 4 used in a teleprompterA one way mirror is typically used as an apparently normal mirror in a brightly lit room with a much darker room on the other side People on the brightly lit side see their own reflection it looks like a normal mirror People on the dark side see through it it looks like a transparent window The light from the bright room reflected from the mirror back into the room itself is much greater than the light transmitted from the dark room overwhelming the small amount of light transmitted from the dark to the bright room conversely the light reflected back into the dark side is overwhelmed by the light transmitted from the bright side This allows a viewer in the dark side to observe the bright room covertly When such mirrors are used for one way observation the viewing room is kept dark by a darkened curtain or a double door vestibule These observation rooms have been used in Execution chambers Experimental psychology research Interrogation rooms Market research Reality television as in the series Big Brother which makes extensive use of one way mirrors throughout its set to allow cameramen in special black hallways to use movable cameras to film contestants without being seen 5 Security observation decks in public areas Train driver or conductor compartments in newer metro trains such as Bombardier Transportation s Movia family of metro trains including the Toronto RocketSmaller versions are sometimes used in Low emissivity windows on vehicles and buildings Mobile phone and tablet screen covers enabling the screen to be used as a mirror when it is off Security cameras where the camera is hidden in a mirrored enclosure Stage effects particularly Pepper s ghost Teleprompters where they allow a presenter to read from text projected onto glass directly in front of a film or television camera Common setups of an infinity mirror illusion Smart mirror virtual mirror and mirror TV Arcade video games such as Taito s Space InvadersThe same type of mirror when used in an optical instrument is called a beam splitter and works on the same principle as a pellicle mirror A partially transparent mirror is also an integral part of the Fabry Perot interferometer See also editOptical isolator See through graphics Window filmReferences edit How to Spot a Two Way Mirror Snopes Retrieved 28 March 2020 The History of Mirrors About com Archived from the original on 22 April 2015 Retrieved 22 April 2015 US patent 720877 Emil Bloch one way mirror published 17 February 1903 assigned to Emil Bloch Finio Ben Arduino controlled RGB LED Infinity Mirror Instructables Autodesk Inc Retrieved 12 August 2017 Tour the Big Brother house camera runs bbspy co uk 28 September 2013 Retrieved 6 March 2014 External links edit nbsp Media related to One way mirror at Wikimedia Commons Retrieved from https en wikipedia org w index php title One way mirror amp oldid 1197121061, wikipedia, wiki, book, books, library,
