A question about our vision Hi, I'm new here and this is the first time to post on this forum. I am really interested in physics and planning to major in mechanical engineer once I apply to colleges soon. However, I have a question that you people could either end the discussion quickly or have controversy.Well, here I go. Our human eye can only see light wavelength at around 780nm~620nm (color red) to 455nm~390nm (color blue/purple). It is true that some animals can see other light spectrum that we human beings cannot see such as bees: they can see ultraviolet lights. Then I have a question, human beings can see X-Ray pictures by converting the light spectrum compatible to our vision, right? (If not, please correct me, because I really am curious of how X-Rays work, wikipedia can be a pain) If that is the case, if we were to see lights beyond our range, will there be views that we have never seen before? Another question! Some people believe in ghosts, or should I say supernatural view. There are even exorcists or people who actually can talk with ghosts. The relation to ghosts and our vision is, animals who can see during the night such as bats and cats sometimes act abnormally. If this is the case, if we human can see objects without light, will we able to see ghosts or any super natural occurences?