If an item was created which was so dark that it absorbed all light, would it appear invisible?

Question

If an item was created which was so dark that it absorbed all light, would it appear invisible?

Answer 1

No it would appear black since it would absorb all light the background would have a black shape in front of it.If however it were on a black background........  

Answer 2

Putting black holes aside, if an object absorbs all the light that hits it, it will heat up.  Now if you conduct the heat away, the temperature of the object will remain constant.  Lets assume this temperature is around room temperature.  The object won't be visible to the naked eye but it could be detected in the infrared since it has to emit long wave photons to stay at constant temperature.  If the heat were not conducted away, the object would heat up enough that it would glow in the visible part of the spectrum, hence you'd see it.  To not see it at all, it would have to have a very low temperature.  Then it would look like an obscuration of the scene behind it to some one looking for it, thus it would be detectable if not directly observable.

Answer 3

Black holes do this.  Any light that gets to close to its gravitation pull can't escape.  However, as matter falls into the black hole before it's too close, it gets very energetic and glows brightly, which can make the location of the black hole very clear.  Also, the gravity bends light around it, so we can "see" the object from its effects on things around it.

If an object was not a black hole but just very dark, you'd still be able to tell it was there because you wouldn't be able to see through it.  This is why soldiers wear camouflage rather than just wearing black (in the daytime at least).  

Answer 4

a body can be visible if all light pass throgh it.... Like a transparent glass without sharp edges.......

Answer 5

It wouldn't look invisible, it would look like a perfectly black object with no texture.  If it were a solid shape (cube, for example), it would look like a 2-dimensional object no matter what angle you viewed it from.  

The reason it wouldn't be invisible is, light wouldn't be able to shine through it, so you wouldn't be able to see through it.