Slit Definition and 1000 Threads

A slit lamp is an instrument consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye. It is used in conjunction with a biomicroscope. The lamp facilitates an examination of the anterior segment and posterior segment of the human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens, and cornea. The binocular slit-lamp examination provides a stereoscopic magnified view of the eye structures in detail, enabling anatomical diagnoses to be made for a variety of eye conditions. A second, hand-held lens is used to examine the retina.

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  1. F

    Width of slit and distance between adjacent maxima

    A laser emitting light with a wavelength of 560 nm is directed at a single slit, producing an interference pattern on a screen that is 3.0 m away. The central maximum is 5.0 cm wide. determine the width of the slit and the distance between adjacent maxima. attempt i used this equation...
  2. N

    Young's doublt slit experiment - Systematic and random errors -

    Young's doublt slit experiment - Systematic and random errors - URGENT! Homework Statement Can anybody think of any other systematic and/or random errors for young's double slit experiment when using it calculate the wavelength of a light source? I have an inclass prac write up tomorrow and...
  3. N

    Diffraction grating & young double slit -light not perpendicular to grating

    Homework Statement I was a asked a question from an experiment: What happens if the light shone into the diffraction grating or a double slit is not perpendicular to the diffraction grating or double slit? What will happen?The Attempt at a Solution Straight away i can tell that the light...
  4. N

    Young's double slit experiment - Independent and dependant variables?

    Homework Statement Hey everyone, I am doing youngs double slit experiment to find the wavelength of a light source but i am having a lot of trouble finding the independent and dependent variables. Can people suggest what they could be? Thanks. Also, some controlled variables would be...
  5. N

    Diffraction - Why must slit width be comparable to the wavelength of light?

    Hey guys, In diffraction of light, why must the slit width be of comparable size to the wavelength of the light being shone on it for diffraction to be noticed most? Thanks
  6. P

    Which Interference Maxima Are Missing in the Slit Experiment?

    Monochromatic light illuminates a pair of thin parallel slits at normal incidence, producing an interference pattern on a distant screen. The width of each slit is 1/7 the center-to-center distance between the slits. Which interference maxima are missing in the pattern on the screen? every...
  7. P

    Double Slit Experiment without the small angle approximation

    Two very narrow slits are spaced 1.8 \mum apart and are placed 35.0 cm from the screen. What is the distance from the first and second dark lines of the interference pattern when the slits are illuminated with coherent light with \lambda =550 nm r1-r2=m\lambda dsin\theta=m\lambda...
  8. I

    Uncertainty and The Double Slit Experiment

    While reading Feynman's 6 Easy Pieces, I see he talks about bouncing photons off of the electrons that are passing through two slits. According to Feynman, when a photon strikes an electron near one of the slits, it bounces (sometimes back at the observer) and registered as a sharp point of...
  9. T

    Calculating Ym and R for Two-Slit Interference: Tips and Tricks"

    Right so I've been stuck with this for a while now and I'm sure it's just something simple that I've missed. Right so the question says there are a pair of closely spaced slits (0.300mm apart). By changing the spacing the bright fringe moves from position m=2 to m=3. The wavelength remains...
  10. S

    Are Buckyballs Entangled in Double Slit Experiments?

    http://en.wikipedia.org/wiki/Quantum_entanglement#cite_note-0" Is there an experiment where bucky balls are entangled? Many of us have heard about bucky balls showing single particle interference in a double slit experiment. However I have not heard of them being entangled. I read the...
  11. L

    Photoelectric Effect after Passing through Double Slit

    Hi, In a double slit experiment, shooting a photon will produce interference pattern on a screen. Using a detector to detect which slit the photon passed through will destroy the interference pattern. The photon will pass through only 1 slit, and cause slit pattern on the screen. The...
  12. H

    Feynman paths and double slit experiment

    I am just inhaling "The Grand Design" and am stuck in the chapter on the "buckyballs" double slit experiment. The authors say that in case of the experiment, a particle may take any possible way ("perhaps to Jupiter and back"), which then Feynman depicts as adding vectors to a result vector...
  13. I

    Quantum entanglement and Two slit experiment

    Hi. Firstly, I'm not a physics student but was just wanting some answers to questions from those that are, so I thought I'd try you lot. :smile: 1. Has anyone proved that quantum entanglement doesn't happen at the macro level? 2. Regarding the 2 slit experiment and how consciousness...
  14. F

    Using the double slit experiment to predict our own actions

    I'm new to quantum physics and the double slit experiment. If the person running the experiment collects the data but does not look at it, does the result of an interference pattern or no interference pattern on the CCD image sensor decide the future of whither that person decides in the future...
  15. R

    Tracking Particle Counts in Double Slit Experiments

    Hi, Is it possible to set up a double slit experiment where the numbers of particles being emitted can be counted and see if it is equal to the numbers detected at the screen? The particles should be Buckyball or other molecules where the energy can be made large compared to single...
  16. M

    Single photon interference time threshold (double slit experiment)

    In the paper (AIP Conf. Proc. 810 (2006), 360): Mardari outlines three predictions of quantum self-interference, all of which empirical evidence is presented that appear to refute all three. The implications of the paper is interesting but of these I am particularly interested in the...
  17. A

    Temporal Superposition and the Double Slit Experiment

    I am confused by an aspect of the infamous double slit experiment. It is said that one way to understand why a succession of single particles can give rise to an interference pattern is that a single particle could be going through both slits simultaneously and interfering with itself. But this...
  18. S

    Exploring Photon Trajectories in Double Slit Experiments

    In the aftermath of the recent Steinberg paper where they reconstruct average photon trajectories in the double-slit experiment, it has been pointed out several times that the reconstructed average trajectories strongly resemble the single-photon trajectories predicted by Bohmina mechanics...
  19. T

    And yet another double slit question thread.

    Ok double slit experiment. Two slits send through one photon which passes through both slits due to wave/particle duality. So really we have two probablity waveforms now don't we? One passing through each slit and creating a wave pattern from the start of each slit. THat's how we get an...
  20. L

    Yet another double slit thread.

    Hi Folks Regarding the double slit problem, I read recently a theory that suggested that the universe itself split creating effectively two particles, which can interfere. Personally I think this is imaginative but it simply doesn't sit right, it seems somehow illogical and wasteful for...
  21. N

    Variation of the double slit experiment

    Hello! I have a question? Does anyone know if scientists have tried to run the electrons through the double slit, record the particles that go through each slit, and before looking at the results, looking at the pattern on the screen. And THEN doing the EXACT OPPOSITE of what the screen...
  22. S

    Double slit - couple questions.

    1. Why are the slits necessary? Do 2 individual light sources of the same frequency without slits or cards create an interference pattern? If not, why not? 2. How do different frequencies of light alter the interference patterns? Any links to experiments of this nature? 3. How about 2...
  23. U

    Tracking Photons in a Double Slit Experiment

    The path of photons can be (almost) reconstructed in a double slit experiment! Observing the Average Trajectories of Single Photons in a Two-Slit Interferometer http://www.sciencemag.org/content/332/6034/1170.abstract Discussion: http://physicsworld.com/cws/article/news/46193...
  24. E

    Understanding Diffraction in a Double Slit Experiment

    i just don't understand diffraction in a double slit , ? how is it related to interference?? like if i want to find how many bright fringes within the central bright fringe of the diffraction envelope? or how many bright fringes are found between the bright fringes of the first and second of...
  25. J

    Basic question regarding the Double Slit Experiment

    I have a question regarding the double slit experiment. I have been doing a little reading (The Grand Design, to be specific) and I was left with a burning question. First of all, I am not a physics major. I have taken only one college physics class, and although it is something that...
  26. A

    GRE question: Young's Double Slit Experiment

    Homework Statement Consider a young double slit experiments where the two slits are spaced d = 0.1mm apart. If when the screen is at a distance of l=1m the first bright maximum is displaced y = 2cm from the central maximum, then find the wavelength of the light. Homework Equations...
  27. T

    Non-Coherent Light Diffraction through Double Slit

    Hi, I'm trying to perform a double slit diffraction experiment without using a laser, but instead using a super-bright, white LED. This LED has been placed inside a sealed box with a small pinhole opening (~1/32 inch diameter). This however introduces the problem that the light is incoherent...
  28. J

    Coincedence Counter in Double Slit Experiment?

    I have what I believe is a simple question about the single photon (at a time) double slit experiment. This experiment does not use a coincidence counter correct? I understand that one, or more, is used for entanglement experiments, but is one necessary to determine an interference or lack of...
  29. V

    Double slit Scattering explanation

    A single particle can behave like its interfering with itself by means of the following explanation (is it true or can you refute it?): Ballentine wrote in his 1970 paper "Statistical Interpretations of Quantum Mechanics": "As in any scattering experiment, quantum theory predicts the...
  30. P

    Quick Question: Double Slit experiment

    This little link here: says that if there is a detection device that observes the electron before it gets to the slits, the observation collapses the wave function. This leads to the electron behaving like a particle rather than a wave as it enters the slit, so two bands are produced on the...
  31. AXidenT

    Should I Pursue a Double Slit Experiment for My Physics EEI?

    (Hope this is the right forum) For my Physics EEI (year 12 extended experimental investigation) I'd really like do some sort of variation of the double slit experiment that can deviate into wave like behaviour of matter etc... I've found ways to have the interference patterns shown using a...
  32. P

    Double Slit Experiment - radioactive particles

    Hello, Quick question: Will radioactive particles give interference pattern if there is no measuring device?
  33. C

    What Mistake Am I Making in Calculating Fringe Width?

    Homework Statement so here i have shown the distances of two dark fringes ... from here ... fringe width is \frac{\lambda L}{2d} L is distance of screen ... d is distance b/w 2 fringes. but fringe width is \frac{\lambda L}{d} , right ? What mistake am i making?
  34. G

    Intensity of single slit and double slit

    After looking at the graphs of single slit and double slit interference of intensity vs. angle, it seems that the intensity drops off very steeply with single slit interference but doesn't drop off at all with double slit interference patterns. Why is that?
  35. V

    Are double slit detectors all electron based?

    Even if you send a buckyball molecule in the emitter, does the detector always give you output in terms of electrons? Isn't there a way to actually check the buckyball located in the detector? Because in normal double slit with electrons. One can argue that the emitter send an electron field...
  36. J

    Explanation of double slit experiment.

    Quantum objects are particles, not waves. Particles are bundles of energy propagating on a field. It is the properties of the field that seem to give particles wave-like qualities. Thus in the Young's double slit experiment, a given particle goes through one and only one of the slits; it does...
  37. J

    Double Slit Interference Pattern

    I am trying to calculate how wide of a screen you would need in order to observe an interference pattern produced by Young's original real-life double slit experiment. He cut a single narrow slit (width ds) in a window shade, admitting a narrow sliver of sunlight into a dark room. He inserted...
  38. V

    What is the secret behind the double slit experiment and how has it been solved?

    According to Richard Feynman, the double-slit experiment contains the only mystery of quantum mechanics. After we have unveiled the mystery, we will be able to understand quantum mechanics. Someone has allegedly solved the double slit mystery and unveiled the secret of Quantum Mechanics...
  39. K

    Single slit diffraction pattern

    Homework Statement A single slit forms a diffraction pattern, with the first minimum at an angle of 40 from the central maximum. Monochromatic light of 410 nm wavelength is used. The same slit, illuminated by a different monochromatic light source, produces a diffraction pattern with the...
  40. J

    Double Slit and coherence of non-point source

    If a "line" source of visible light is not really a line but has a width of 1mm, how far must it be from a double slit which it illuminates in order for the two slits to be reasonably coherent? Assume the slit separation is .5mm. I approached this problem the same as finding the distance...
  41. L

    When we want to show quantum behavior (like tunneling or double slit)

    When we want to show quantum behavior (like tunneling or double slit) of a large object like a buckyball molecule, what do we need to watch out for in an experiment? Is it the following? a, that all constituents of the object (the single atoms of the buckyball) are described by one coherent...
  42. P

    Does a Hidden Detector Affect the Double-Slit Experiment?

    Double Slit and "The Observer" Hi! First of all, I am just getting started in Physics, so I apologize if this is a silly question. I was talking with my boyfriend (who has a degree in physics) about the double slit experiment. Obviously, if you perform the experiment one electron (or...
  43. M

    Exploring Quantum Mechanics with Double Slit Experiments

    Sorry for the rambling nature of this post. Hello,I am not a student or teacher.Just a regular person,browsing Youtube.I came across the delayed choice eraser. http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser I am confused... Does that mean that anything that will never be...
  44. D

    Double Slit Experiment: Red Laser vs Green Laser

    I tried to do the double slit experiment at home with a green laser (for a science project at school and for fun). I failed but someone succeeded with a red laser. Is it true that a red laser works better because it has a longer wavelength?
  45. P

    Single and Double Slit Diffraction and Interference

    I have no idea where to start with these questions. I am pretty sure I have to use these equations 1. theta = tan^-1(x/D) 2. wsintheta = nlambda 3. dsintheta = nlambda Which order m of in the two-slit interference pattern will give the least uncertainty in the slit spacing, d? a) m = 1 b)...
  46. E

    Single slit interference and Diffraction Grating

    Lets say I have a double slit interference experiment set up. Now if I cover one slit what CHANGES would be observed ? I know I would see fewer bright fringes and that the intensity of the bright fringes would fall. Is there anything else ?In a different scenario I have a diffraction grating...
  47. S

    Vertical double slit experiment separation of bright spots in air and water

    Homework Statement A scientist decides to do the double-slit experiment in a ver- tical tube, with the slits at the top and a viewing screen at the bottom as shown. With red light from a HeNe laser (632 nm) a nice pattern forms on the viewing screen, with the bright spots 1.50 cm apart...
  48. P

    What is the Width of the Central Maximum in Single Slit Diffraction?

    Homework Statement A single slit 10-4m wide(a) is illuminated by plane waves from helium-neon laser ( l = 6.328*10-7m). If the observing screen is 10m(D) away, determine the width of the central maximum(y). Homework Equations sin(alpha)=(m+0.5)*l/a tan(aplha)~sin(alpha)=y/2*D...
  49. F

    Solve Double Slit Maxima with 3 Narrow Slits

    Homework Statement 3 narrow slits with spacing of d and 3d/2 as in picture, the slits are irradiated from left with a plane of monochromatic light with wavelength 2d/5. If the bottom slit is covered with a filter that introduces a half phase change, how many principal maxima will be...
  50. K

    Coherent electrons in double slit experiment?

    Experimentally how do we make sure that the ejected electrons are coherent?
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