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. AlexChandler

    Question about Double Slit Experiment with Electrons

    In my modern physics course we learned that electrons, when shot through two close together slits, will produce an interference pattern just light light. However, when you set up an experiment to observe which slit the electron goes through, there is no longer an interference pattern. To my...
  2. M

    Determining wavelength of double slit experiment

    Homework Statement If i have the intensity pattern of a double slit experiment and aim to find the wavelength of the monochromatic light incident on the slits with the following information, - width of each slit - distance to the screen - intensity pattern (displacement Vs intensity)...
  3. W

    Far-apart double slit experiment

    What if: 1) we put a swtich gate on the bottom slit. The bottom slit is normally closed, but we time it so we open it just before a photon/electron MAY arrive. so far this will yeild the same result as traditional experiment? 2) usually the two slits are close by, but we move it very...
  4. jegues

    Central Diffraction Maximum Double Slit

    Homework Statement When a 450-nm light is incident normally on a certain double-slit system, the number of interference maxima within the central diffraction maxima is 5. When 900-nm light is incident on the same slit system, the number of interference maxima within the central diffraction...
  5. S

    Double Slit Experiment - Measurement Problem

    Question Suppose molecules are placed next to the slits that fluoresce when electron passes, emitting a photon that can be imaged. Explain why this is no better than direct illumination, and explain how the two-slit interference pattern is destroyed. My Answer In direct illumination, a...
  6. J

    [Novice] Young's Double Slit Experiment and the Quantum Cult

    Whilst skulking through Youtube videos for a deeper understanding of quantum mechanics I noticed that vidoes offering accurate, legitimate, remotely-science-based information were few and far between. The rest seemed to be videos of people saying that we, as thinking beings, create the...
  7. B

    Can the intensity of soundwaves be affected by the size of a gap?

    Ok so I was sitting out back one day listening to some music with some friends around. We had some music playing on a stereo inside the house and we were out the back with the glass door open about 10 cm's. I thought I noticed that some sounds with different frequencies seemed louder then...
  8. R

    Buckyball Double Slit Experiment

    　 Buckyball Double Slit Experiment I've been reading old archives here and even the FAQ and still not definite about the answer. It is said that a buckyball composed of 60 carbon atoms can still form interference pattern at the screen. It is not the complexity of the object but the fact...
  9. Z

    What Value of d/a Causes Diffraction to Eliminate the Third Bright Side Fringe?

    Homework Statement (a) In a double-slit system, what value of d/a causes diffraction to eliminate the third bright side fringe? Homework Equations I(\theta) = I_mcos^2(\beta)(\frac{sin(\alpha)}{\alpha})^2 \beta =\frac{\pi d}{\lambda} sin \theta \alpha = \frac{\pi a}{\lambda} sin \theta...
  10. M

    Young Double Slit experiment, single photons

    Hello, I was wondering if I could get any help with the following question/thing: Why does a stream of photons (let's say that one is fired every 3 seconds) at a double slit as shown in Young's double slit experiment create an interference pattern although there is no interference because the...
  11. R

    Strings Double Slit Experiment

    If electrons are strings (in string theory), what happened to the string between emission at the double slit experiment and detection on the screen after it passes thru the 2 slits? Does the string splitted and joined again after the slits? Before string theory, we just say particle...
  12. jegues

    How Do You Determine the Exact Phase Difference in Single Slit Diffraction?

    Homework Statement See figure attached. Homework Equations The Attempt at a Solution \Delta L = asin\theta = m \lambda If the waves are in phase, we would expect L to me a integer number of wavelengths, when they are out of phase, L should be an odd number of wavelengths, but...
  13. M

    How to measure which slit a photon went through

    The double slit experiment is often described like this: (I'll describe the photon version, but of course the electron one is the same) "We fire individual photons at a screen with two slits. An interference pattern appears. But when we try to look at the slits to figure out which slit the...
  14. JJBladester

    Single Slit Diffraction light intensity

    Homework Statement This is the light intensity on a viewing screen behind a rectangular opening in a screen. Is the shape of the opening (1), (2), or (3)? Homework Equations w=(2λL)/a where w is the width of the central maximum, L is the distance to the viewing screen, and a is...
  15. M

    Double Slit Experiment: The Observer's Eye Affecting Matter

    A friend of mine pointed out this website to me. http://www.doubleslitexperiment.com/ The site posts an interesting theory; I'll take a quote from the sites document: "For some unknown reason that haunts scientists, everything we perceive as having mass is just a wave of information (or...
  16. jegues

    Double Slit, Central Diffraction Maximum

    Homework Statement See figure attached for problem statement as well as my attempt Homework Equations The Attempt at a Solution I don't know where to go from here. Can someone help me get started?
  17. jegues

    Double Laser Interference: Solving for Small Angles

    Homework Statement See figure attached for problem statement as well as my attempt Homework Equations The Attempt at a Solution I don't know where to go from here. Can someone help me get started?
  18. jegues

    How do I solve this Thick Film, Double Slit problem?

    Homework Statement See figure attached for problem statement as well as my attempt. Homework Equations The Attempt at a Solution I don't know where to go from here. Can someone help me get started?
  19. M

    How Do You Calculate Slit Separation in a Double Slit Experiment?

    Homework Statement Red plane waves from a ruby laser (694.3nm) in air pass through two parallel slits in an opaque screen. A fringe pattern forms on a distant wall and we see the fourth bright band 1o above the central axis. (Counting the central bright fringe as zero). Calculate the...
  20. F

    An awesome video on the double slit experiment

  21. M

    Diffraction - Calculating Width of a Slit

    Homework Statement I am required to calculate the width of a single slit. I have known distance, L, between the observation screen and the slit, and photo images were taken of the resulting waveform. However, the wavelength is unknown, therefore making many of the equations I'm attempting to...
  22. P

    Double Slit Exp: What Really Happened?

    My question is about the double slit experiment..I was just listening to a guy explain this experiment on youtube and I got skeptical at one point in his explanation. He said that when the photons went through the double slits the detectors were turned" on" then the observers viewed the results...
  23. M

    Young's Double Slit Experiment - Slit Separation Calculation

    Homework Statement Calculate the slit separation (d) given that: Wavelength = 650 nm (Plugged in 6.5*10^-7 m) m = 1 (plugged in 1) Distance to screen (D) = 37.5 cm (plugged in 0.375m) Distance between centre to side order (y) = 0.7 cm (pluged in 0.007m) Homework Equations We were only given...
  24. P

    Some very simple double slit experiment questions

    Hi, I'm new here and have been thinking about the double slit experiment (with one photon at a time). As I understand it, you fire one photon, it goes through both slits, interferes with itself and hits a point on the detector according to probabilities that correspond to what you would...
  25. M

    Laser Interference and Diffraction, single and double slit experiment?

    Homework Statement I did the single slit light diffraction lab. The diode laser we used was 630-680 nm. It produced an image very much like the one on this page: http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/fraungeo.html#c1 How does having multiple wavelengths in the laser change...
  26. L

    Multiple wavelengths of light through much larger single slit

    A text I am reading noted that as a multichromatic light source (consisting of many individual peaks) is passed through the my slit (order .25mm) the peaks will be spread over the neighboring wavelengths in a roughly Gaussian distribution. I am trying to understand why this is, and how I would...
  27. L

    Multiple wavelengths of light through much larger single slit

    A text I am reading noted that as a multichromatic light source (consisting of many individual peaks) is passed through the my slit (order .25mm) the peaks will be spread over the neighboring wavelengths in a roughly Gaussian distribution. I am trying to understand why this is, and how I would...
  28. K

    Can I Create a Focussed Electron Beam at Home with Household Items?

    Hi all, Is it possible to do the Young's double slit experiment at home? A related question: Can I generate a focussed electron beam from house hold items? Thanks Ravi
  29. Y

    Speed of photons through dual slit.

    Let us say we have source that can emit a single photon. We can in principle detect when the photon leaves the source due to the momentum kick. Now let us say this single photon passes through both slits and forms a dot on the far right of the screen. Now if we draw paths through the two slits...
  30. U

    Time travel and the double slit experiment?

    I'm pretty much a newbie to this quantum physics stuff, but the one thing that really blows my mind is the double slit experiment. I just don't make much sense. Anyways, I was wondering, could the interference pattern caused by firing a single particle through the double slits be the case of...
  31. W

    Question about double slit experiment

    I have a question about the double split experiment, don't know if it's been asked before... Specifically, I have read and watched in some videos explaining that, when shooting electrons, physicists decided to shoot 'one electron at a time', to make sure they are not interfering with each...
  32. chris2112

    Double slit experiment question

    Have there been any experiments done where a particle was detected to go through one or the other slits when after the detector was destroyed before the data could be known by a human? Does the detector's detection alone determine a particle rather than a wave behavior?
  33. A

    Calculating Third Maximum in Single Slit Illuminated by He-Ne Laser

    Homework Statement A single slit is illuminated with a helium-neon laser whose wavelength is 633 nm. If the slit width is 2.2 x 10 e-5 m, calculate the position of the third maximum in degrees Homework Equations Sin Theta(m) = (m + 0.5) Lambda/w The Attempt at a Solution...
  34. U

    Double slit experiment at event horizon of a BH

    Consider a double slit experiment at the event horizon of a black hole, with 1 slit on each side of the horizon, one observer inside and 1 outside, inside observer should observe interference by equivalence principle, whereas outside one should not, since the photons can't enter the second slit...
  35. D

    Italian double slit electron experiment

    Since my ability to respond to articles was messed up by someone and I have been unable to get any help straightening out the problem I wish to comment on the article here. I have always thought it more than a bit unusual that anyone would consider it "strange" that EM radiation, particles...
  36. G

    Why does laser on a hair/wire creat a single slit?

    I was wondering why laser on a hair makes the hair act like a single slit. I already know about Huygen's Principle behind it and all that. But what is it that can convince you that it actually is a SINGLE slit and not a double, other than just seeing it by measuring min. and using mλ = d * sinα...
  37. H

    Electron Single Slit Diffraction

    Homework Statement Electrons pass through a 10-6m wide slit with a speed of 1.5 x 106m/s. How wide is the electron diffraction pattern on a detector 1 m behind the slit. Homework Equations \lambda=h/mv (matter waves) asin\theta=m\lambda (path length difference for constructive...
  38. E

    In the double slit experiment - what exactly is the measuring device?

    In the double slit experiment - what exactly is the measuring device? .. the have to measure witch slit the photon went trough - how do they do it? - measuring anything means interacting with it. Changing it, really. So, isn't it obvious that interacting with the photon in any way will...
  39. R

    How Are Slits Made for the Double Slit Experiment?

    Hello all, I have some questions in regards to the double slit experiment. Now I apologise if some of these seem very basic, likewise if they are very hard to explain, however it is something I would like to get a better grasp on. First, you are firing out of said ‘gun’; let’s say a...
  40. N

    Measurement disturbance - double slit

    When electrons are passed through a double slit and can either display a wave-like interference pattern or a particle-like build-up pattern, is that because their momentum/direction is changed by the measuring device interacting with them, or due to some other feature associated with being...
  41. M

    Can recording the dual slit experiment affect future outcomes?

    I am familiar with the dual slit experiment up to the point where measuring at one slit made the interference pattern collapse. My question is has anyone tried using a sensor of some kind that has no memory or output? Does the observer have to be sentient? I have a feeling someone has...
  42. C

    How Does Light Interact with a Slit in Single Slit Diffraction?

    When light goes through a narrow single slit it diffracts. And you can explain this with the uncertainty principle or the wave-like nature of light. But if a photon can only be in one medium at a time then how does it know its going through a slit , How is it interacting with the edges of the...
  43. fluidistic

    Single slit, optics, special case

    I've thought about the case when the wavelength of the incident EM waves on a single slit is much greater than the width of the slit. When we have \lambda >> D. It could be the case of a radiowave incidating over a single slit whose width is day a nanometer large. According to Hecht, the...
  44. L

    Monochromatic Red Light Diffraction: Exploring the Effects on Rainbow Fringes

    Consider one slit white light diffraction which produces rainbow fringe - black fringe - white fringe-black fringe-rainbow fringe. That is, continuous spectrum (or...two continuous spectrums). My question is, instead of white light, project monochromatic red light. What happens then leaving all...
  45. I

    Double Slit Interference Question

    Homework Statement Light of wavelength 680 nm falls on two slits and produces an interference pattern in which thefourth-order fringe is 38 mm from the central fringe on a screen 2.0 m away. What is the separationof the two slits? Homework Equations Sintheta=2m(\lambda2d)...
  46. C

    Which wave function and operator is responsible for the Double Slit Experiment?

    I know this may be a completely stupid question and it's so fundamental but... As we all know the first thing we learn is basically the duality between waves and particles (e.g electron). This is shown via the double slit experiment. Now I know how to explain it if it were water waves, and...
  47. T

    Double Slit Experiment on Refracted light?

    Has anyone done the double slit experiment on light after being refracted into its separate colors of the spectrum? (Hope I asked this right, because I'm curious if each individual color still behaves the same way as when unrefracted light is passed through the two slits) I guess what I'm...
  48. H

    Double Slit Quantum and Electricity Experiment

    Homework Statement Suppose electrons are sent through a double slit set up with a the slit width = 5.00nm and d the slit separation = 10.0nm. If the maximum current at the screen is 2.30μA, what is the current at the point .500 cm above the central maximum? Homework Equations dsinθ=mλ...
  49. T

    Why Does Single-Slit Diffraction Create a Pattern of Maxima and Minima?

    When waves diffract through one slit why does it form a series of maxima and minima when there is no interference?...our teacher won't tell us and its really annoying me...and i have no idea why it should. please help! ~sorry if this is in he wrong place
  50. Z

    5 Slit Experimen: Probability Distribution Function

    1. Homework Statement [/b] given the following probability distribution function from 5 slits (y is verticle on screen) P(y) = A | \sum(from n=-2 to 2) exp(ikR(n)) |^2 where k = 2\pi/\lambda and R(n) ~ \approx R-nyD/L Show that the probability distribution as a function of angle...
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