swansont Posted February 13, 2014 Share Posted February 13, 2014 O.K. If I put a water pipe around the laser stream, does that change the experiment? I don't think so. We know that the photon has been emitted from the laser. Point A. We know that the photon passed through one or the 2 slits. Point B. We know that the photon hit the screnn somewhere. Point C No matter the real or quantic way, path, wave or how-do-you-call-that, we know that tthe photon went through points A B C. My question is the following: When points A B C are not aligned, the photon must have changed direction, no? The photon goes through both slits; it's a wave until you detect it. Link to comment Share on other sites More sharing options...
michel123456 Posted February 13, 2014 Author Share Posted February 13, 2014 The photon goes through both slits; it's a wave until you detect it. O.K. Even in the case it goes through both slits, did he change direction or not? Link to comment Share on other sites More sharing options...
swansont Posted February 13, 2014 Share Posted February 13, 2014 O.K. Even in the case it goes through both slits, did he change direction or not? It doesn't have a well-defined trajectory, so "change direction" is not really a meaningful expression. Link to comment Share on other sites More sharing options...
John Cuthber Posted February 13, 2014 Share Posted February 13, 2014 O.K. If I put a water pipe around the laser stream, does that change the experiment? I don't think so. Sorry to dissapoint you, but it does. The end of the pipe behaves like a hole in a barrier so there's diffraction and, as soon as the light leaves the pipe, it starts to spread out. So, it doesn't have a well defined "direction" to change. Link to comment Share on other sites More sharing options...
michel123456 Posted February 13, 2014 Author Share Posted February 13, 2014 (edited) Sorry to dissapoint you, but it does. The end of the pipe behaves like a hole in a barrier so there's diffraction and, as soon as the light leaves the pipe, it starts to spread out. So, it doesn't have a well defined "direction" to change. What is the difference with a slit? Isn't a slit also a "hole in a barrier"? (edit) i don't expect that to make any change in the experiment. (edit#2) Especially if the pipe is wide enough and does not touch the laser beam. It doesn't have a well-defined trajectory, so "change direction" is not really a meaningful expression. I thought that light follows a straight line. (Sorry, a geodesic) Edited February 13, 2014 by michel123456 Link to comment Share on other sites More sharing options...
swansont Posted February 13, 2014 Share Posted February 13, 2014 I thought that light follows a straight line. (Sorry, a geodesic) That's GR, which is very different from QM. Link to comment Share on other sites More sharing options...
John Cuthber Posted February 14, 2014 Share Posted February 14, 2014 What is the difference with a slit? Isn't a slit also a "hole in a barrier"? (edit) i don't expect that to make any change in the experiment. (edit#2) Especially if the pipe is wide enough and does not touch the laser beam. I thought that light follows a straight line. (Sorry, a geodesic) The hole is just like a slit. Once the light has gone through it, it spreads out, by diffraction. That's my point. The pipe would need to be infinitely wide not to touch the sides of the beam. That's he point of a Gaussian beam profile. Link to comment Share on other sites More sharing options...
michel123456 Posted February 14, 2014 Author Share Posted February 14, 2014 That's GR, which is very different from QM. Here in Greece all photons are GR Link to comment Share on other sites More sharing options...
sheever Posted February 23, 2014 Share Posted February 23, 2014 Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted February 24, 2014 Share Posted February 24, 2014 ! Moderator Note sheever, Please be aware that we have recently updated our forum rules regarding video posts. We now ask that members do not make posts containing only videos. As with links, they should act only as supporting information and you will need to actually provide some text. This goes for your other post, here. Link to comment Share on other sites More sharing options...
sheever Posted February 24, 2014 Share Posted February 24, 2014 (edited) The reason I didn't make a comment because I didn't want to involve my work here as I would of then get warned for that .I couldn't be able to avoid this problem while I wanted to give you valuable detail to members . Although I understand the admins purpose of keeping topics tight in the same time you guys giving hard time to members for expressing opinions freely Edited February 24, 2014 by sheever Link to comment Share on other sites More sharing options...
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