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. CHOP

    I Double slit interactive detector

    my understanding is that there has never been a double slit experiment with a detector at the slit, where that detector's state was changed as a result of a particle being at that slit. if true, then if such a schema was possible and tried, then there would be no interference, and the reason...
  2. S

    I Exploring the Double Slit Experiment: The Mystery of Empty Space on the Screen

    General question to members, when you look at the results and the interference pattern of the double slit experiment for electrons. Does anyone have information on what the empty space is on the screen. The electrons fixed location on the screen shows gaps always. I watched one persons theory...
  3. D

    Double Slit Experiment, Observation Affects Reality

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  4. A

    I Coherence, Young's double slit experiments.

    In most textbook/internet explanation of light coherence, it gives two conditions 1) monochromatic light, same frequency. 2) light in phase or constant phase difference. Only with the two conditions can light interference pattern be observed in the double slit experiment. But this cannot be...
  5. S

    Exploring the Three Slit Interference Pattern: Differences and Effects

    https://www.google.com/amp/s/phys.org/news/2017-01-physicists-exotic-looped-trajectories-three-slit.amp Based on this I was wondering how the interference pattern with three slits instead of two would look. Is there a difference; is there more interference fringes? Or does the interference...
  6. Marco Masi

    I Double slit displaying anti-fringes?

    The conventional Young double slit experiment displays the interference fringes with the first intensity maxima at the center of the detection screen ('center' means aligned with the center between two slits of equal aperture). These are simply called 'fringes'. However, I'm wondering if and how...
  7. Marco Masi

    I Double slit with a quarter wave polarizer on one slit

    Suppose a linear polarized light wave front is incident on a double slit. What happens if one places a quarter-wave polarizer in front of only one slit in the double slit experiment? Does one obtain the usual inteference fringes? Or the diffraction pattern only? Else?
  8. Sandeep T S

    I Wave function collapse in a double slit experiment

    Is anyone did experiment on wave function collapse in double slit experiment. Could you please share information about that, and also share research paper about that experiment. What kind of observation done here, what kind of equipment used for that?
  9. Y

    What is the Relation Between Distance and Angle in Double Slit Interference?

    Homework Statement question (iii) 2. Homework Equations D=sd/λ (where D is the distance from slit to screen, s is the distance to the central maxima, and d is the slit separation)[/B] The Attempt at a Solution I plugged the values s=0.3*10^(-3), d=4.5*10^(-3) and λ=633*10^(-9), and got the...
  10. S

    I Compound double slit with measurement on only one

    This question relates to the double slit experiment where measurement affects whether an interference pattern is generated. If an experiment were performed where electrons were sent through a double slit with another double slit behind the first double slit, and the measurement device measured...
  11. G

    I Send the measurement device through a double slit

    Hi. Double slit experiments are being performed successfully with increasingly large molecules. Some physicists (e.g. Anton Zeilinger) believe it might work with viruses as well. Assuming it works with a system that qualifies as a measurement device (be it a virus or something else complex...
  12. R

    I Photon detector on a dual slit experiment

    My experiment is to place a detector on one of the slits in the dual slit experiment so That it would record or not the passage of the photon, and then reset the detector to its base state, Erasing the result. In such a case, would the interference pattern be destroyed simply because the...
  13. J

    I Detecting Interference Patterns with Large Objects: The Double Slit Experiment

    Why is it so difficult to detect interference patterns with larger objects in the double slit experiment(e.g. bacteria)?
  14. S

    B Double slit experiment w/ light shining thru one aperture only

    Hi, Will there be interference if I point the laser thru one of the openings of the double slit aperture only while the other one is open? And is the interference more pronounced or the same if I shine it thru both the apertures at the same time.
  15. S

    B Double Slit Experiment with Gamma Rays

    Hi I was wondering what would happen if you use Gamma Rays in a double slit experiment. Would you see the same interference pattern?
  16. zehkari

    How to Find y in a Double Slit Experiment Without Intensity Values?

    Homework Statement Homework Equations (1) Φ = 2π*(dsinθ/λ) (2) Itotal = I0 cos2(Φ/2) (3) Itotal = I0 cos2(πdy/λR) λ = 585 * 10-9 m R = 0.700 m d = 0.320 * 10-3 m y = ? The Attempt at a Solution a) I used eqn (1) and divided the total oscillations by a complete oscillation to find the...
  17. P

    The Difference Between Diffraction And Interference Patterns

    I've recently come across this problem: Answer true or false. If light shines through 2 slits, will the diffraction pattern always be within the interference pattern. I don't understand this question, however. How can the interference and diffraction pattern be separated in this situation...
  18. DoobleD

    I Why is the number of wavelets in a slit = slit length / lambda

    Hi folks, Huygens principle is not really new to me but I just realized there is something I don't understand with it. Take a single 1D slit with a coherent incident plane wave. It seems that the number of wavelets in the slits is ##n = l/\lambda##, where ##l## is the length of the slit, and...
  19. G

    B Dynamics of the double slit experiment

    The spatial orientation of the double slit setup be so that the screen extends in a plane ##x = constant##, while the entire apparatus sits on a ray perpendicular to the screen (of course, the slits sit and extend a bit off this ray). My questions are about the dynamics in x-direction if only a...
  20. B

    I Double slit one source same as no slits with two sources?

    Instead of using a single source and two slits, imagine just using two sources the same distance apart as were the slits... The two sources are controlled by a device that has two modes of operation, selected by a two position switch labeled D and R: D is "determined" - the emission from the...
  21. P

    A Young's double slit experiment with excited atoms

    i would like to find the detailed calculation in the case of a two slits experiment with an excited atom. i only found the formulas when it decays near the slits. have you links? thanks
  22. A

    B Double slit experiment: What if the detector is removed quickly?

    Hi all! I'm a physics enthusiast and I've been reading/watching a lot of stuff about the double slit experiments. I was watching a youtube video about the delayed quantum eraser experiment and it was really interesting and got me thinking. So here's my question. What if the detector is placed...
  23. P

    I Particle goes through a double slit + decays, what happens?

    What would happen if you send a particle towards a double slit, it goes through interacting with itself quantumly, however before it reaches the screen it decays emitting radiation (Alpha, beta and/or Gamma)? Would you still see the same pattern on the screen? Would it affect the wave function...
  24. M

    I Dimensions of the double slits in comparison to the electron?

    what are the dimensions of the double slits in comparison to the electron? what keeps the electron from decaying outside the environment of an atom long enough to run the experiment? how are the electrons detected before and after the slits?
  25. T

    I Photon detectors in a double slit experiment

    It is said that if one shoots photons in a double slit experiment, and place a detectors around the slits to find which slit the photon went, one will not see the photon interfere. However, to detect a photon, one must absorb it. So how does the photon detectors work by detecting the photons and...
  26. K

    B Carrier wave double slit experiment

    If you created the following double slit experiment would you still see interference? 1) Modify the slits so that the path from photon source through one of the slits to the detector is much shorter than the path through the other slit. 2) put a shutter in front of the photon source so that you...
  27. platosuniverse

    B Why doesn't the plate interact with the particle in double slit?

    When particles are shot at the plate/screen in the double slit experiment, why doesn't the particles interact with the screen? Shouldn't the plate act as an observer and "collapse" the wave function into one or the other slit? Why does it take a measuring apparatus to know which slit the...
  28. P

    Single photon and double slit experiment

    hi are the path lengths to the slits strictly equal? If the difference of the path lengths is progressively increased, how evolve the fringes visibility?
  29. J

    A Photon direction as hidden variable in a double slit expt?

    I was wondering if it would be feasible to set up something like the following experiment to validate the pilot wave theory. The idea here is to set up a double slit experiment, but control the initial conditions of photons emitted from a source (i.e., their directions) such that one can...
  30. S

    Young's double slit experiment green laser

    Homework Statement If a green laser is (wavelength = 532nm) sent through two slits with a separation of 127 um, how wide (in total) would the 11 green dots formed be if they were projected onto a screen 1.25m away from the slits? Refer to this diagram sorry for bad quality...
  31. I

    B Double slit and wave particle duality

    Just for my knowledge, not to confuse the OP, why would you say, for example, the double slit experiment does not show both of these properties in one measurement method? [Mentors' more: this thread was forked off from another thread]
  32. S

    I Young's double slit: why fringes gets dimmer and inconsistent?

    Hi all! In Young's double slit experiment, there are two things I cannot explain. Any help is appreciated! The first one is why the bright fringes get dimmer as you get further from the central/brightest spot. My theory, after looking in the two books I have, is that each single slit decreases...
  33. MermaidWonders

    MHB Solving for Slit Width-Wavelength Ratio at $\pm90°$ Diffraction Pattern

    For what ratio of slit width to wavelength will the first minima of a single-slit diffraction pattern occur at $\pm 90°$? The thing is, when I did it, I used the formula $sin\theta = \frac{n\lambda}{a}$, and used the fact that $m = 1$ and $\pm 90°$ to solve for $\frac{a}{\lambda}$. However, I...
  34. C

    Determining the width of a slit

    Homework Statement A laser emitting light with a wavelength of 560nm is directed at a single slit, producing an interference pattern on a screen 3.0m away. The central maximum is 5.0cm wide. 10mks Determine the width of the slit and the distance between adjacent maxima.[/B] Homework Equations...
  35. EF17xx

    Statement slit separation young's double slit

    Homework Statement For accurate measurement of the fringe separation, a small as possible slit separation should be used. Homework Equations s=λD/d The Attempt at a Solution Why is this statement correct ?
  36. EF17xx

    Single/double slit diffraction intensity

    Homework Statement SINGLE SLIT Why does the intensity at maxima decrease further away from the central maxima in a single slit diffraction. DOUBLE SLIT Slit width: Why is the intensity of a double slit interference pattern the same at each maxima. (constructive interference) When the slit...
  37. C

    Slit Width & Single Slit Diffraction

    Homework Statement Consider ultrasound with a frequency of 40 kHz. (a) What is the wavelength and period of a 40 kHz sound wave? (b) The slit width required to give the first order diffraction minimum at thirty degrees. (c) Calculate the angles at which the first three minimums should be...
  38. M

    Inteference Fringes of Double Slit Experiment in Water

    Homework Statement Suppose a double-slit experiment is immersed in water (with an index of refraction of 1.33). When in the water, what happens to the interference fringes? Homework Equations λ = λ0 / n y = (λmL) / d d = distance between slits L = distance to viewing screen n = index of...
  39. S

    Double Slit Wave Interference - what is m?

    Hi, I'm doing a very simple problem, but I don't understand the diagram provided (see image below). What is m here? I know that m is the order with respect to the central bright fringe, but there isn't a central bright fringe (assuming those circles are the bright fringes)? Homework...
  40. D

    B Different size slits in Young's double slit experiment

    Hi all I was wondering what happens if one slit in youngs double slit is bigger than the other? I recon that the of maxima will rise and in minima, there will be no dark spot, but dim light instead. Is that correct? If not can you please explain what happens? Thanks
  41. R

    Understanding Diffraction at a Single Slit: Notes and Resources

    [Mentors' note: This thread has been edited to change the level tag from 'A' to 'I'] Hello guys, I want the deduction part of- diffraction at single slit: Plz sent me the notes of this.
  42. PumpkinCougar95

    B Young's Double slit experiment with different slit sizes

    What would happen if a youngs double slit experiment is done with different slit sizes? I get the feeling that the intensity might never be zero as the waves might never cancel out completely. Am I right? How should I analyse the Intensity? Would I have to do something like what is done while...
  43. Physics345

    Thomas Young's double slit experiment

    Homework Statement a) Explain why a pattern of bright and dark fringes visible on a screen when a light is shone through a double slit. b) Upon using Thomas Young's double-slit experiment to obtain measurements, the following data were obtained. use this data to determine the wavelength of...
  44. A

    Young's double slit experiment with two sets of slits

    1. The problem statement, all variables and given/known da Homework Equations Interference minima is asinΘ=nλ/2 where n=1,3,5,7... [/B]The Attempt at a Solution Putting ab/(2sqrt(b^2/4+d^2))=λ/2 for first order minima And solving for d I get (b/2)*sqrt((2a/λ)^2-1) in which only the 2 factor...
  45. A

    Intensity for Young’s Double Slit Interference

    Homework Statement Hi The experimental setup involved a helium neon laser of wavelength 670nm +- 1nm, pointed towards a lens with focal length 500mm +- 1mm. (so that the equations used corresponded to the far field diffraction pattern) and onto a photo diode so that for all intents and...
  46. G

    Uncertainty for a particle diffracted through a single slit

    Homework Statement A horizontal beam of laser light of wavelength 486 nm passes through a narrow slit that has width 0.0590 mm . The intensity of the light is measured on a vertical screen that is 2.90 m from the slit. What is the minimum uncertainty in the vertical component of the momentum...
  47. ElanaC

    B Double slit experiment question

    Hi, I have two questions concerning the double slit experiment in the scenario where we fire one photon at a time and it interacts with itself to create an interference pattern over time: - Does the photon actually interact with itself or with the photons fired before/after it? - What happens...
  48. D

    B What is the result of putting a detector on both slits in the 2 slit experiment?

    In the 2 slit experiment , what would be the result if we put a dedector on both slits? would we get an interference patern?
  49. A

    A Decoherence in the double slit experiment

    I have two questions about the following type of scenario: We have a laser sending photons through the usual double slit apparatus giving us the usual interference pattern, except that now we introduce some physical matter (that are not photons) that the photons will interact with before going...
  50. M

    B Double-Slit Experiment: Exploring SR's Impact on Time

    Special Relativity dictates that if there is relative motion between two objects; their relative experience of time will change and this is measurable at velocities approaching 'c'. Within the context of the Double-slit Experiment (with detection): When a given quantum-duality is detected by a...
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