Recent content by tim1608

Hi Everyone Thank you all very much for your replies. Thank you, Mike, for these links. The emPower glasses look interesting. I think that for the time being, I will just need to remove my glasses whenever i need to reed any very small writing up close. Kind regards Tim

Hi Rumborak I am not querying what was before time. I am querying whether or not it has a beginning. I agree that it does not make sense to ask what was before time. If time does not have a beginning or end then asking what was before or after it would be like asking what is beyond infinity. I...

Hi Jfizzix and Rumborak Thank you both very much for your replies To be honest, I find this a bit difficult to get my head around because it suggests a reversal of past and future. However, I suppose it fits in with the idea of spacetime as an unchanging four-dimensional block. which is carved...

Hi Everyone. This thread relates to the ongoing debate as to whether or not time has a beginning and other related debates. As I see it, a beginning of time would imply the past existence of a very first cause which was not the effect of a previous cause. Who agrees and who disagrees with this...

Hi Simon Thank you for your reply. I think that what you have described might exactly what I saw. Do you think that it might work if the bands are extremely fine? Or do you think this would cause too much diffraction or some other similar phenomenon which would mess it up? Kind regards Tim

Hi Simon and Andy Thank you very much for your replies. This rings a bell. I think what I saw about ten years ago involved concentric interleaving. Yes, I know about what you have said about lenticular images. To be honest, I think that my faded memories from ten years ago were confusing the...

Hi phinds Thank you very much for your reply. I think the idea is that the lenses present to your eye both the focused image and the blurry image together and your brain learns to filter out the blurry image. Kind regards Tim

Hi Everyone I am not sure but I seem to remember that about ten years ago, I either read something or saw something on TV about a revolutionary new type of lens which could potentially replace bifocal and varifocal spectacle lenses. The main drawback of bifocal and varifocal lenses is that you...

Hi I have just watched a fascinating documentary on YouTube called "Atomic Physics and Reality" which describes an experiment conducted by Alain Aspect regarding two entangled photons traveling in opposite directions towards polarised filters oriented at different angles. I would be very...

Hi Atyy Thank you very much for your reply. When you are "shutting up and calculating", are you just doing so using equations you have been taught by other people or are you working on new aspects of QM? I think my dispute is basically that I don't believe you can just "shut up and...

Hi Everyone I would like to get your opinions on something to do with the philosophy of QM. Quite a few quantum physicists say that when working out something to do with QM, you should just "shut up and calculate" which means that you should not be trying to visualise what is going on. I...

Hi Bahamagreen Thank you for your reply. There are no complicated formulas. It is just as follows: Column A: absolute values Column B: absolute values Column D = Column A Column E = -Column A Column F = Column B Column G = -Column B Column I = Column D + Column G Column J =...

Hi Cthugha In my previous thread which has now been closed, you mentioned the Hong-Ou-Mandel effect. I have attempted to simulate it in an Excel spreadsheet but I have not managed to obtain the correct-looking results. I have attached a Jpeg of the spreadsheet and would be very grateful if...

Does anyone know of anything in macroscopic probability theory which operates on the basis of adding indistinguishables and then squaring?

Hi Carrz As I understand it, the emitter does not emit the photon as a particle that already knows its location. Instead, all that the emitter emits is a wavefunction which corresponds to an associated probability distribution which describes where the photon might be. The precise information...