News tagged with invisible
Now You See It, Now You Don't -- an Invisibility Cloak Made of Glass
(PhysOrg.com) -- From Tolkien's ring of power in The Lord of the Rings to Star Trek's Romulans, who could make their warships disappear from view, from Harry Potter's magical cloak to the garment that makes ...
Jul 21, 2010 |
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Researchers design more reliable invisibility cloak
(PhysOrg.com) -- Researchers have proposed a new design for an invisibility cloak - a device that could make objects invisible by guiding light around anything placed inside the cloak.
Jun 24, 2010 |
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Newly developed cloak hides underwater objects from sonar
In one University of Illinois lab, invisibility is a matter of now you hear it, now you don't.
Jan 05, 2011 |
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Invisibility cloak that generates virtual images gets closer to realization
(PhysOrg.com) -- In a twist on the concept of an invisibility cloak, researchers have designed a material that not only makes an object invisible, but also generates one or more virtual images in its place. ...
Apr 02, 2010 |
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A breakthrough in superlens development: Cheap, simple lens to let us see a single virus
A superlens would let you see a virus in a drop of blood and open the door to better and cheaper electronics. It might, says Durdu Guney, make ultra-high-resolution microscopes as commonplace as cameras in ...
Jan 09, 2012 |
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Al Qaeda suspect's porn film found to contain treasure trove of secret documents
A suspected member of the Al Qaeda terrorist group, arrested in May last year in Germany, was found with a memory stick hidden in his underwear. Police discovered the stick contained a password-protected folder ...
May 04, 2012 |
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'Space-time cloak' to conceal events revealed in new study
(PhysOrg.com) -- The study, by researchers from Imperial College London, involves a new class of materials called metamaterials, which can be artificially engineered to distort light or sound waves. With conventional ...
Nov 16, 2010 |
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'Invisibility cloak' could protect against earthquakes
(PhysOrg.com) -- Research at the University of Liverpool has shown it is possible to develop an 'invisibility cloak' to protect buildings from earthquakes.
Jul 20, 2009 |
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Light speed hurdle to invisibility cloak overcome by undergraduate
(PhysOrg.com) -- An undergraduate student has overcome a major hurdle in the development of invisibility cloaks by adding an optical device into their design that not only remains invisible itself, but also has the ability ...
Aug 09, 2011 |
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Invisibility carpet cloak can hide objects from visible light
(PhysOrg.com) -- Most of the invisibility cloaks that have been demonstrated to date conceal objects at frequencies that are not detectable by the human eye. Designing invisibility cloaks that can conceal ...
Jun 15, 2011 |
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New invisibility cloak allows object to 'see' out through the cloak
(PhysOrg.com) -- "Many groups have been working devices that make objects invisible," Che Ting Chan tells PhysOrg.com. “Most of these devices, however, encompass the object to be cloaked.” Chan, a scientist at The Hong K ...
Mar 13, 2009 |
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Scientists closer to making invisibility cloak a reality
J.K. Rowling may not have realized just how close Harry Potter's invisibility cloak was to becoming a reality when she introduced it in the first book of her best-selling fictional series in 1998. Scientists, however, have ...
Mar 05, 2009 |
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Invisibility cloaks may be just around the corner
In 1897, H.G. Wells created a fictional scientist who became invisible by changing his refractive index to that of air, so that his body could not absorb or reflect light. More recently, Harry Potter disappeared ...
Mar 04, 2011 |
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The guiding of light: A new metamaterial device steers beams along complex pathways
Using a composite metamaterial to deliver a complex set of instructions to a beam of light, Boston College physicists have created a device to guide electromagnetic waves around objects such as the corner ...
Jul 31, 2009 |
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Cloak of invisibility: Engineers use plasmonics to create an invisible photodetector
A team of engineers at Stanford and the University of Pennsylvania has for the first time used "plasmonic cloaking" to create a device that can see without being seen - an invisible machine that detects light. It is the first ...
May 21, 2012 |
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Invisibility
Invisibility is the state of an object that cannot be seen. An object in this state is said to be invisible (literally, "not visible"). The term is usually used as a fantasy/science fiction term, where objects are literally made unseeable by magical or technological means; however, its effects can also be seen in the real world, particularly in physics and perceptional psychology.
Since objects can be seen by light in the visible spectrum from a source reflecting off their surfaces and hitting the viewer's eye, the most natural form of invisibility (whether real or fictional) is an object that neither reflects nor absorbs light (that is, it allows light to pass through it). In nature, this is known as transparency, and is seen in many naturally occurring materials (although no naturally occurring material is 100% transparent).
Visibility also depends on the eyes of the observer and/or the instruments used. Thus an object can be classified as "invisible to" a person, animal, instrument, etc. In the research of sensorial perception invisibility has been shown to happen in cycles.
Invisibility is often considered the supreme form of camouflage, as it doesn't show any kind of vital, visual, nor any of the frequencies of the electromagnetic spectrum such as radio, infrared, ultra violet, etc.
For more information about Invisibility, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
