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.
No, it isn't a new invention, it's an optical illusion. I was discussing a new ductwork design for an existing (recently renovated) building with my boss. I needed to clarify something, so I printed out the attached picture and sketched-in the duct, roughly like I have it sketched in the...
How can one be invisible??
I am working on a science fiction.I am sorry to open such a thread in the general physics section but i thought I could get the maximum possible logic from this section.Its about making someone invisible.What are the faintest possible ways to do that??Please give me...
If an object is incapable of reflecting and absorbing light, our eyes wouldn't be able to see it, correct?
Do you think a solid or liquid mass on Earth is capable of resisting light absorption and reflection to a degree that it's entirely unseen (therefore achieving true invisiblity)? Do you...
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This was made by a scientist in japan.
http://news.bbc.co.uk/cbbcnews/hi/s...000/2730639.stm
And they improved it. (Go down to see new version)
http://projects.star.t.u-tokyo.ac.j...EDIA/xv/oc.html...
Hi folks. I'm a novelist working on a story that could use a physicist's help. Unfortunately, I know nothing about physics (I was an English major, as you might expect)!
One of the characters in my new story has the ability to turn invisible. I would like to have a plausible explanation...
This has been bugging me for some time and I'd love to get a clearer picture. We know that photos from the various moon missions show a black sky without stars, and that has been explained to me before as resulting from the fact that those photos were taken in broad daylight, plus maybe the...
I have a question about radio frequency blocking. I recently purchased one of those invisible dog fences to keep the new puppy from becoming roadkill.
Pretty basic install except when it came to "blanking" out an area for the dog to go into and out of the area. The instructions said to run two...
Say we have one weight floating in free space - vacuum and another weight in the same space on total distance D from the first. I’ll tell you the answer but any way my question for you is: “Is there a lever between the weights”? My answer is yes. Here is how I know it. First I have to find the...
This topic has interested me ever since I read H. G. Wells' The Invisible Man: How can you make someone truly invisible?
Any ideas are welcome, as I have never thought of a scientifically (or even logically) feasible way.
Ive not seen this hanging around here before so i thought i MIGHT bring it up :) how possible would it be to become totally invisible?
I knwo there is this stuff about the natural phase (??) of everything, and if the phase can be changed then you become invisible? Is this possible? If so how...