thought or experiment. to provide an answer in the article, or an image of the result, defeats the entire purpose of the question. if you want to know what the result is you can either follow the link in the article, or you can do the experiment.
but some people might choose to think about this for themselves, and giving the answer would prevent that.
and the question is about the why. everyone i ever ask seems simply to do the experiment, look up the answer, or tell me how a photocopier works. i was hoping someone would be able to reason out the why you get the result you do, not 