The Original Double Slit Experiment

> We speak of "noise" (interference) Note that interference here has a very technical meaning that is NOT noise. (Sorry for the all-caps, but it's very important in these experiments.) I think you don't understand the important point in the double slit experiment. Let's try to explain it, but it's a long explanation. --- First you must understand the single slit experiment. If the slit is thin enough you get a nice diffraction patter. If this spread was caused by dust or something like that, a good guess is that the image gets a gaussian blur like exp(-x^2). In a diffraction experiment, the image you get is something like sin²(x)/x². (You should draw them in Wolfram Alpha or something.) The main difference is that the first one is always positive, so you get light everywhere, but it get's dimmer very soon. The second one has a lot of zeros, so you get strips of light and darkness. The math details are complicated, so let's ignore them. You can do this experimentally. In the lab we used two razorblades with some screws to move them arcuately. There should be plenty of recipes in Internet to reproduce it. You can try it in more dusty environments, and clean environment. Sharp razorblades, not sharp razorblades. Wind or not wind. Try it a few times until you get use to the images it produces. You will notice that the cleaner environment produce the better results, so I hope you will get convinced that it's not caused by the dust or something You can probably buy some single slit