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. S

    Double Slit - Post Incident Detection

    Hey All, I'm probably going to get railed for not searching hard enough for an answer to my idiotic question, but here goes anyways... The double slit experiment results go like this [correct me if I'm wrong here] 1/ One slit open --> One band\probability dist. 2/ Two slits open -->...
  2. M

    Young's Double Slit Experiment science fair

    I plan on trying to recreate a version of Young's double slit experiment for a science fair. All the methods I've found for it recommend using a helium-neon laser. Would a laser pointer or some other cheaper laser work? For the slits my idea is to get a glass microscope slide, paint over it then...
  3. E

    Photon detector used in Young's Double Slit experiment?

    I am trying to recreate Young's double slit experiment and I can't figure out what he used to detect the photons. In some things I read it says he used a photographic plate. However, these are outdated and no longer available. Any ideas?
  4. N

    Double Slit Experiment: Does Energy Decrease?

    In the double slit experiment is it known if the energy of the "particle" is less after passing the plate?
  5. O

    Question about double slit experiment with detectors

    I've read that when one performs the double slit experiment (dse) without any detectors to "see" which slit the photon goes through one gets an interference pattern. When one places a detector to see which slit the photon goes through the interference pattern disappears. My question are these...
  6. K

    Full quantum mechanical description of the double slit experiment

    Many textbooks use the double slit experiment to introduce quantum effects. However, all texts I know use handwaving arguments instead of the whole formalism of QM. Especially dynamics is completely omitted. I don't expect that a complete microscopic description -including the walls- has been...
  7. E

    Can a Photomultiplier Detect Single Photons for a DIY Double Slit Experiment?

    I'm trying to perform young's double slit experiment at home and I need assistance. Several problems arise such as what should be used as the light source (laser vs low watt bulb) and the photon detector (photomultiplier vs phototransistor). My goal is to replicate the scenario where one...
  8. L

    Double slit in macroscopic world

    It doesn't have to be a superfluid or silicon oil. Let's suppose a water droplets are falling to a hidrophobic (wd40 sprayed LOL) surface with double slits. It seems probable to me that scenario will happen that droplet will split on surface, pass through both slits (in some random ratio) and...
  9. C

    Double Slit Wave Interference Question

    Homework Statement Blue light (λ = 482 nm) is directed through parallel slits separated by 0.15 mm. A fringe pattern appears on a ascreen 2.00 m away. How far from the central axis on either side are the second order dark bands? λ = 4.82 x 10-7 m d = 1.5 x10-4 m L = 2.00 m m = 2 y= ...
  10. E

    Young Double Slit Experiment Help

    I am trying to recreate the Young double slit experiment at my house with a laser. You could call it a homemade experiment I suppose. My question is if I use a laser pointer for my photon source what would I use as the photon detector. I want to have some sort of screen that can detect the...
  11. S

    Question about the Double Slit Experiment

    It maybe the lateness of the hour, but I've just had another one of those awkward thoughts that only people who know more than I do can provide an answer for (I'm compelled to edit quickly and note that by this I mean that no one I know's going to have a clue, not that I'm somehow an authority...
  12. G

    Does Electron Coulomb Repulsion Affect the Double-Slit Experiment Pattern?

    hi i often heard about the double-slit experiment with electrons and read that it would give the same pattern as the double-slit experiment with photons. so the only difference would be the shorter de-broglie wavelength of electrons compared with the wavelength of ordinary photons. but i...
  13. E

    My thought on double slit experiment

    hi! first of all: I take the opportunity to introduce myself and to say hello to every member of this forum. now. I'm not a pro-physicist: I'm a programmer/3d graphic artist/musician/and everything else curious; so go easy on me :) I was seeing a BBC's documentary about "what is reality"...
  14. G

    Double Slit - Observation Appartaus is Key?

    Hi - brand new here, so go easy on me! :) I have been considering that the major difference between the observed and the unobserved in relation to the behaviour of light particles appears to be missing something. Every "measurement" device used in the unobserved tests relies on linear...
  15. G

    Uncertainty principle and single slit experiment

    hi my concern is, that there is a huge amount of equations that are somehow related to the uncertainty principle and it is not straightforwardly obvious to me, when i have to use which of them. let me put it this way: as far as i see, there is this overall applicable equation that says ΔxΔp ≥...
  16. S

    Single slit single particle interference

    If we send one photon, at a time, through a single slit do we observe the interference pattern? Specially at the edges
  17. L

    Feynmann's electron double slit experiment

    Hi, I was trying to learn a bit of quantum mechanics from Feynman lectures. In the 3rd volume of the Feynman lectures, he talks of the double slit experiment with electrons. He says that if we keep a light source near the first slit, so that every time an electron passes it scatters light and...
  18. Hydr0matic

    Testing Quantum vs. Classical Physics Predictions of Which-Way Double Slit

    If we add polarizers to the slits like DrChinese describes above, I believe there is a difference in predicted outcomes between quantum physics and classical physics. A difference I believe can be tested. Both quantum and classical physics predict that the interference pattern will disappear...
  19. H

    Young Double Slit Experiment (Determine wavelength of light source)

    Homework Statement Upon using Thomas Young's double slit experiment to obtain measurements, the following data was obtained. Use this data to determine the wavelength of light being used to create the interference pattern. DO this in 3 different ways! The Angle to the Eighth maximum is 1.12...
  20. O

    Doublie slit w/ electron problem

    Homework Statement In a Young’s double-sit experiment performed with electrons, the two slits are separated by a distance of 2.0 x 10^-6m. The first-order bright fringes are located on the observation screen at an angle of 1.6 x 10^-4 degrees. Find the wavelength and momentum of the...
  21. I

    How does the placement of a lens behind a slit affect the diffraction pattern?

    Homework Statement How does adding a lens behind a slit alter the diffraction pattern given you know it's focal length? Homework Equations I know currently that i'd look at equations such as: y_{n} = \frac{nD\lambda}{d} Destructive and so fourth But what about the lens, does that...
  22. H

    We know that if we send one electron through 2 slit, the wave function

    we know that if we send one electron through 2 slit, the wave function on the curtain(detector) is a wave that it's maximum is in the center. and we can find electron anywhere on the curtain according to it's probability. but i want to know whether we observe the electron on all part of the...
  23. E

    Double slit experiment for AP physics

    Hello, I'm not sure if this is the right part of the forum to be posting this in (if it's not, feel free to move me), but I have a question about the double slit experiment. For my AP Physics class, a group of seven other guys and myself are researching the double slit experiment, both...
  24. W

    Successful Double Slit Experiment

    I performed a successful double slit experiment this morning. I'm doing it for my science fair, and I spent four hours last night trying to figure it out. I used every material I had that could be used. This morning, I woke up, rushed to the bathroom, and grabbed a comb. I used electical tape...
  25. S

    Newbie Question - Double Slit Experiment - 'Interference Patterns'

    I am relatively new to QM and so have a couple of basic questions for you all. I understand that the double slit experiment creates an ‘interference pattern’. What bothers me, is that it seems like an assumption to me, that the pattern created could *only* have been made by two waves...
  26. J

    Physics - Single Slit Diffraction

    Hi Guys, my textbook mentioned that how the equation for the minima for single slit diffraction was derived: Consider a slit of width W with 2 light rays, one emitting from the edge, one emitting from the center. Their path difference is W/2 sin T . If the path difference is 1/2 lambda, then...
  27. perplexabot

    Finding WavelengthHow do I find the wavelength using single slit diffraction?

    Hi all. So let us say I shine a laser through a slit of width w, the distance to the screen is L, the distance from the center of the pattern formed to the first next bright fringe (next because the center is a bright fringe) is a. Using Fraunhofer diffraction. Given variables: a, w and L...
  28. H

    The double slit and wave particle nature.

    I have recently learned about the double slit experiments using electrons and photons. This has completely blown my mind and I want to learn more. With this aim I have a question that I hope somebody on here can answer. For this question I want to consider the use of electrons in the double...
  29. P

    Can Multiple Electrons in a Double Slit System Interfere With Each Other?

    So I read that in double slit systems the intensity of the "particle" source does not matter. If it is known that only one particle is in the system at a time, the interference pattern will be the same as observed when there are multiple particles in the system. From this we can conclude that...
  30. A

    Double slit experiment question?

    Has anyone taken into account the gravity of the slit material causing the electrons to quiver and cause a wave effect in the double slit experiment?
  31. R

    Grilling the Double Slit Experiment

    A detector screen far from the slits will show wave patterns whereas a detector near the screen will show particles. My question is what if we maintain the detector screen far from the slits but put some say block of wood near the slits, will we detect wave or paticles?
  32. T

    Single slit interfernce with large particels

    Why and how do large particles emit single slit interference, also why do electrons not. Also do single atoms display single slit interferance? How is this explained by the copanhagen interpretations as opposed to the bohm interpretation? How does bohm explain single slit collapse with...
  33. C

    Diffraction through a single slit

    This isn't a homework question per se, I'm just wondering about something in my textbook (Halliday & Resnick) that isn't clear to me: This figure shows intensity as a function of angle (0 degrees is the center) for three experiments that use single slits of different width. The one on the...
  34. 4

    Exploring Double Slit Experiment with Non-Light Systems

    can the double slit experiment be performed with systems other than light?
  35. D

    Derivation of Young's double slit formula problem

    Hi hi, first post ^^ Anyway, I encountered this little problem with the derivation of Young's double slit formula. The standard derivation found on the internet and my textbook is shown here: http://schools.matter.org.uk/content/interference/formula.html When deriving, a few errors had...
  36. A

    Under what conditions will wave functions collapse in double slit experiments?

    1. Will wave functions collapse in a photon double-slit experiment after we place a detector at one of its slits and detect one photon? 2. Will wave functions collapse in a photon double-slit experiment after we detect a photon on the screen? 3. Will wave functions collapse in an electron...
  37. P

    Diffraction Through a Sub-Wavelength Sized Slit?

    I was wondering what occurs when light encounters a slit that happens to be smaller than the wavelength of light that's trying to go through it. Does it just reflect back, does part of it go through thereby making the light have a shorter wavelength that matches the slit, what actually...
  38. K

    Why Does Peak Intensity Not Double in a Double Slit Experiment?

    Hey guys, I've just got a couple of questions about this prelab I need to do for the Double Slit experiment. And just to make sure this is clear (I have no idea whether the method used in this experiment is normal) we have a double slit and a slit blocker. The slit blocker is after the...
  39. J

    Young's Double Slit Experiment in Water

    Homework Statement If Young's double-slit experiment were submerged in water, how would the fringe pattern be changed? Homework Equations None...but maybe d\sin(\theta)=m\lambda The Attempt at a Solution It would not because the waves still propagate in the same manner and the...
  40. D

    Can Single Photon Measurements Reveal Quantum Interference or Particle Behavior?

    I'm not a physicist, but have been thinking about these test lately and have hit some roadblocks that should be answerable. 1. Why can't we measure a single photon to determine if it fell into the interference pattern or acted as a particle? I understand this is because I'm thinking of two...
  41. StevieTNZ

    Double Slit Experiment With Detectors

    Hi there, I've been told even with detectors behind two slits detecting if a particle comes through, that doesn't exactly mean that the quantum system is now in a mixed-state (for example, the quantum eraser experiment of Scully). How would we be able to differentiate between whether the...
  42. M

    Why must the two slits be at the same distance in the double slit experiment?

    in the double slit experiment , why must the two slits be at the same distance from the first slit?should the interfering waves have the same phase and why?
  43. P

    Single Slit Diffraction find central maximum

    Hi, I have tried tackling these question but I am simply absolutely lost... 1. A single slit of width 1.50 um is illuminated with light of wavelength 500.0 nm. Find the angular width of the central maximum. I have no attempt for number 1. 2. Microwaves of wavelength 2.8 cm fall on...
  44. T

    Optimizing 4-slit Interference Pattern for θ1st Min with Homework Solution

    Homework Statement A 4-slit interference pattern is created by 4 slits spaced 2μm apart. At what approximate angle θ does the intensity go to zero the first time, if the incoming light has a wavelength of 450 nm? θ1st min = Homework Equations d*sinθ = m\lambda The Attempt at a...
  45. O

    Need an Exact Explanation of the Double Slit Experiment

    All I know about the Double Slit Experiment is that some particles are shot at a pair of slits, and the particle apparently splits, goes through both slits, and interferes with itself, creating an interference pattern, but if the particles are observed, they collapse and give the results you'd...
  46. L

    Measurement of (brightness of) double slit experiment

    Hi, I think that this is (should be) a straight forward question: when conducting the double slit experiment, is there a relationship between the brightness / measure of the light source and the sum of the "peaks" from the interference pattern? (I have done a number of searches but can't find...
  47. J

    Using the Double Slit Experiment & encoding photons with binary data

    My name is Joe Fiero. Ever since I was a little kid, I loved science, especially science fiction. Sliders, Back to the future, Star Trek. I never had a chance to get a degree in the things I loved the most because I came from a poor family... which has lead me to a path of self education and...
  48. E

    Double slit experiment & time (action at a distance?)

    hi, Please help me understand this... could you set up the double slit experiment (light, one photon at a time) in such a way that you could measure the time between a photon leaving the gun and arriving at the detector? you could then calculate the path the photon took, so would the...
  49. Y

    One electron two slit exeriment when one eletron is emited after 1 hour

    If one eletron is emitted to two slit after 1 hour from the time when the last electon is emitted, the interference pattern will form on the screen? if one elector is emmited by one day, then same interferece pattern will show? How do you think of it? Is there such a exeriment?
  50. C

    Double-slit experiment, one slit covered with glass

    Homework Statement In a double-slit experiment, He-Ne laser light of wavelength 633 nm produced an interference pattern on a screen placed at some distance from the slits. When one of the slits was covered with a thin glass slide of thickness 12.0 um, the central fringe shifted to the point...
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