Traduction et analyse de mots par intelligence artificielle ChatGPT
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Qu'est-ce (qui) est invisibility - définition
![[[Alberich]] puts on the [[Tarnhelm]] and vanishes; illustration by [[Arthur Rackham]] to [[Richard Wagner]]'s ''[[Das Rheingold]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Illustration to Richard Wagner's "Das Rheingold".jpg?width=200 "[[Alberich]] puts on the [[Tarnhelm]] and vanishes; illustration by [[Arthur Rackham]] to [[Richard Wagner]]'s ''[[Das Rheingold]]''")
Wikipédia
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 phenomenon is studied by physics and perceptual 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). This is known as transparency, and is seen in many naturally occurring materials (although no naturally occurring material is 100% transparent).
Invisibility perception depends on several optical and visual factors. For example, invisibility 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 research on sensorial perception it has been shown that invisibility is perceived in cycles.
Invisibility is often considered to be the supreme form of camouflage, as it does not reveal to the viewer any kind of vital signs, visual effects, or any frequencies of the electromagnetic spectrum detectable to the human eye, instead making use of radio, infrared or ultraviolet wavelengths.
In illusion optics, invisibility is a special case of illusion effects: the illusion of free space.
The term is often used in fantasy and science fiction, where objects cannot be seen by means of magic or hypothetical technology.
