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It depends on what kind of "invisibility" you mean, if you'd be able to assume the temperature and texture of any material you'd be invisible but could still see. If you mean invisibility by breaking light you can't really say, since we don't yet know how we could use this to make a human body invisible, thereforce we don't know the counter meassures yet
That's not invisibility just camouflage.
Like, you can have the same texture as the wall you are standing in front of, but you'd still show up as a human-shaped piece of wall protruding out. Or if a bug was to crawl on the wall behind you, you'd block it's view.
That depends on the angle you're looking at it from but yes.
But I don't think we wouldn't find any counter meassures if we happen to invent a perfect technology to turn invisible