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. M

    How Wide is the Central Bright Fringe in Single Slit Diffraction?

    Single slit diffraction Homework Statement Red light of wavelength 633nm from a helium-neon laser passes through a slit 0.390mm wide. The diffraction pattern is observed on a screen 3.00m away. Define the width of a bright fringe as the distance between the minima on either side. What is...
  2. B

    Doublw slit experoment and fourier transform

    is the interference pattern produced by a double slit a one dimensional phase/amplitude Fourier transform? and if you did a reverse Fourier transform on it would you get an image of the two slits?
  3. P

    Archived Finding the distance between two fringes in a double slit experiment

    Homework Statement Blue light of wavelength 400 nm passes through two slits which are a distance d = 1×10−4 m apart. This produces a double slit pattern on a screen L = 12 m away. (The screen is parallel to the plane of the two slits.) If the central bright fringe is denoted the “m=0...
  4. Z

    Is a 100mw Green Laser Too Powerful for Double Slit Experiments and Microscopy?

    Hi forums I really want to do some experiments with lasers and i was wondering if for the double slit experiment a 100mw green laser is so powerful and bright. also there is a 30mw laser, would that be better. another thing is that i wanted to make a laser "microscope" but i was worried that a...
  5. S

    Effect of photon detection mid-way between (double) slit and screen

    In a single particle double slit (self-interference) experiment: the which-way information is got by having the detection instrument (or at-least part of the instrumentation) right next to the slits.To make it easier, Let's assume the following x-coordinates: at source of photon x = 0 slits...
  6. R

    Find Distance from Screen to Slits in Double Slit Experiment

    Homework Statement See attached image Homework Equations y=L*tan(theta) m*(lambda)=d*sin(theta) The Attempt at a Solution Lambda = 640 nm = 6.4x10^-4 mm m*(lambda)=d*sin(theta) 1*(6.4x10^-4 mm) = (0.25 mm)*sin(theta) theta = 0.15 degrees y = L*tan(theta) This is...
  7. C

    Young's double slit experiment vs single slit

    Why did Young specifically perform a double-slit experiment to demonstrate the wave nature of light, since light will diffract and interfere even through a single slit? Is there something special demonstrated by the double-slit experiment that's not demonstrated by a single-slit experiment...
  8. A

    Calculating Wavelength and Central Maximum Width Using Single Slit Equations

    Homework Statement A beam of light of unknown wavelength is incident on a screen with a single-slit. Observing the interference pattern on the projection screen that is 1.7 m away, the 4th minimum is 27 cm away from the central line. The width of the slit is 15 μm. a) What is the wavelength...
  9. S

    Double slit experiment - no interference in the vicinity of light

    Hi, I'm reading N. Zettili Quantum mechanics. In the "double slit experiment", when the beam of the electrons pass the the two slits, they present an interference pattern on the screen. But when we have a light source there to trace the electrons, we see what we have expected to see of the...
  10. I

    What Is the Distance Between the Slits in Young's Double Slit Experiment?

    Homework Statement Light from a sodium lamp (\lambda \; =\;589\;{\rm nm}) illuminates two narrow slits. The fringe spacing on a screen 150{\rm cm} behind the slits is 4.0{\rm mm} . Homework Equations I think I should use: d*(y/L) = m(λ) The Attempt at a Solution I did: d =...
  11. B

    Has the double slit experiment been conducted without a detector?

    Hi, I was watching a Royal Institution lecture on this experiment. Using light, it's not quantum physics, it's waves; when the lecturer considered using particles, like individual atoms, and no detector, you get bands like an interference pattern. Is this something that has actually been done...
  12. F

    What Would Happen If We Set Up the Double Slit Experiment Differently?

    I realize that the people here must be sick of answering stupid questions about the double slit experiment, and different ways of setting it up, but if I may, I have a question about what you would expect to see if the double slit experiment were set up in a slightly different manner, and why...
  13. Q

    Archived How Can You Calculate the Wavelength in a Double Slit Experiment?

    Homework Statement The following data was obtained via the double slit experiment: angle to the eighth maximum = 1.12 degrees distance from slits to screen = 302cm = 3.02m distance from first to fifth mimum = 2.95cm distance between slits = 0.00025m find the wavelength. Homework Equations...
  14. Q

    Calculating Wavelength from Interference Pattern: Narrow Slits and Laser Light

    Homework Statement Two narrow slits are cut into a sheet of paper and set in front of a laser beam, causing an interference pattern to appear on the wall. If the distance from one slit to the third bright fringe is 0.5000004 m and the distance from the other slit to the same bright fringe is...
  15. L

    Equipment required to to the electron double slit experiment ?

    Hi can any point me to a site/paper on how to construct the equipment required for the electron double slit experiment ? Thanks Lachlan
  16. P

    The double slit experiment – What do I need to know?

    I'd like to know a few things: Are there different explanations of this experiment, and if so – which are the most common? What are the different implications and how much do we understand about it today? __________ I don't know much about quantum physics, but I'd like to learn and since I'm...
  17. Z

    Double Slit - Multiple Observers

    I'm sorry if this has already been completed or already discussed. If so, just link me to answer the question, thanks. What if we conduct a double slit experiment with two observers? We use a detector to see which slit the electron passes through. Observer A receives results that the...
  18. G

    Understanding the Single Slit Diffraction Pattern

    I'm confused about the single slit diffraction pattern. Why are light and dark patterns? Where is the constructive and destructive interference occurring if there is just one wave?
  19. I

    Double slit experiment doesn't work

    I took a piece of carton and cut out to strands in it. When I shine the line through it, it only projects the two strands on the other side. I tried it with every light in my house but it still didn't work. what do I have to do, to create the wave interference pattern on the other side. Thank you
  20. R

    Does a Detector Alter Diffraction Patterns in the Two-Slit Experiment?

    In the two slit experiment when which path information is present there is no wave interference pattern such as would be seen with both slits being used. When a single slit is used there is a visible diffraction pattern. Is such a pattern seen when a detector forces a one slit path in the two...
  21. R

    Optics (double slit experiment)

    Homework Statement I have some difficulty understanding a part of the following problem: In Young’s experiment, narrow double slits 0.20 mm apart diffract monochromatic light onto a screen 1.5 m away. The distance between the 5th minima on either side of the zeroth-order maximum is...
  22. I

    Is Feynman's interpretation of the double slit experiment universally accepted?

    in the experiement does the electron/photon always split and physically go through both slits or is this just an interpretation of the results? I believe this is Feynmans interpretation. is it universally accepted?
  23. D

    Understanding the Mystery of Electrons: The Laser Slit Test

    So the laser test with the slits is as followed as far as I understand. When observed, electrons act as particles. When not observed, electrons act as waves. How can electrons know if your eyes are open or closed? Unless your eyes give off some wort of radiation that it can pick up on...
  24. C

    What Happens When Multiple Slits Are Used for Diffraction?

    Hi there. It's not actually a problem, I was just trying to figure it out, so idk if this is the right section for this post, but anyways: I've managed to derive the expression for the Fraunhofer diffraction in a single slit, such that the distance between a minimum and the central point is...
  25. C

    Diffraction With A Single Slit And A Lens.

    Homework Statement Trying to find the number of diffraction maxima and the width of the whole pattern. \lambda = 500nm b = 2.8μm (Slit Width) f = 100mm r = 25mm L = 25mm (Slit to Lens) Homework Equations I have the worked out the irradiance formula as: I(\theta)=I_0...
  26. jaumzaum

    Why the central fringe is brighter in the double slit experiment

    Why the central fringe in the double slit experiment is brighter than the others? I've tried but I still cannot undersand this. Can somone try to explain it to me. I don't know too much in modern physics, please be patient :) thanks for any help
  27. S

    Ripple Tank, Double Slit: Waves

    Homework Statement A double-slit interference experiment is done in a ripple tank (a water tank using a vibrating rod to produce a plane wave on the surface of the water). The slits are 6.00 cm apart, and a viewing screen is 2.15 m from the slits. The wave speed of the ripples in water is...
  28. W

    How Many Constructive Interference Fringes Are Formed on the Screen?

    Homework Statement 605-nm light passes through a pair of slits and creates an interference pattern on a screen 2.0 m behind the slits. The slits are separated by 0.120 mm and each slit is 0.040 mm wide. How many constructive interference fringes are formed on the screen? (Many of these fringes...
  29. M

    Are Both Angles in Young's Double Slit Experiment Equal?

    I am trying to prove that the two θ are equal from this picture http://en.wikipedia.org/wiki/File:Double_slit.svg How do I go about proving this?
  30. I

    Double Slit Quantum Eraser, Really?

    Hello all, I have been reading about quantum entanglement on this webpage. It builds up to the quantum eraser where two entangled photons are produced using a BBO crystal, that have opposite polarity, with one going through a double slit to a detector and the other going to another detector...
  31. C

    Single electron single slit interference

    single electron diffraction through single slit Hi Guys Wondered if you could help me. Say a high energy electron (low wavelength?) is fired through an arrangement of atoms (single slit). How does a single electron hit a detector / screen according to a diffraction pattern? I understand...
  32. S

    Multiple Slit Interference - 3rd Slit Added Between 2 Slits

    Homework Statement Suppose a third slit of the same width were added halfway between the original two slits. (the original two slits were a distance d apart). When there were just 2 slits, the point C was the center (a principal max), point Z was the first maximum after C, point Y was the...
  33. B

    Help With Simple Single Slit Diffraction Pattern?

    Homework Statement Plane light waves are incident on a single slit of width 2.45 cm. The second dark fringe is observed at 44.3° from the central axis. What is the wavelength of the light? Homework Equations θ=pλ/a... where theta is in radians, p =2 (second light minimum), and a = slit...
  34. C

    Finding slit seperation in two-slit experiment

    Homework Statement Light from a He-Ne laser (\lambda = 632.8nm) strikes a pair of slits at normal incidence, forming a double-slit interference pattern on a screen located 1.50 from the slits. The figure shows the interference pattern observed on the screen What is the slit separation...
  35. A

    Double Slit Experiment Question

    I understand that in the Double Slit Experiment that the particle will only go through one slit if it is measured or observed. But will the particle only go through the slit observed or is it 50/50? Also any other info on the experiment that might help me or even just interest me? Any articles I...
  36. S

    Intensity from the double slit.

    Homework Statement Laser light of wavelength λ is incident onto a pair of narrow slits of width a and spacing dWrite down an expression for the intensity as a function of angle of the angle measured from the central axis, θ, in the far-*‐fieldHomework Equations The Attempt at a Solution I...
  37. P

    Wave Nature of Light - Calculating Wavelength (Double Slit Exp)

    Homework Statement Monochromatic light falls on two very narrow slits 0.046 mm apart. Successive fringes on a screen 5.30 m away are 7.0 cm apart near the center of the pattern. Determine the wavelength of the light to two significant figures. Homework Equations x2 ≈ Lθ2 = L (2λ) / d...
  38. E

    Just a quick question about the double slit experiment.

    If electrons are shot through the double slit one at a time, is it observed that each electron hits randomly in one of the dense areas of an interference pattern, or is it only observed after a long time that the interference pattern emerges? To rephrase, what I'm asking is whether a single...
  39. J

    Diffraction from a single slit, with Lens

    Homework Statement Parallel rays of green mercury light with a wavelength of 546 nm pass through a slit covering a lens with a focal length of 60.0 cm. In the focal plane of the lens the distance from the central maximum to the first minimum is 10.2 mm. What is the width of the slit...
  40. N

    Find the number of fringes that will shift in young's double slit experiment

    Homework Statement Monochromatic light of wavelength 600nm is used in a young's 'double slit experiment . One of the slits is covered with a thin transparent layer (1.8 * 10^-9m ) made of a material of refractive index n(1.6). How many fringes will shift due to the introduction of the...
  41. Z

    Double Slit - any interference?

    Homework Statement Can wave-like behaviour, eg interference or diffraction, be observed with the following? Electrons with a velocity of 20 m/s passing through a double slit with a separation of 2nmHomework Equations The Attempt at a Solution The solution is given in the book. λ = 2.65 x...
  42. I

    Young's Double Slit Experiment with Single Photon Counters and Offset Mask

    I was thinking about this. Setup a Young's double slit experiment as follows. Single Photon Source /Pulsed Photon source -> Single Slit-> Mask with two Slits (Slit 1 and Slit 2 )-> Detection plane consisting of many single photon counters. I am assuming it's possible to detect the...
  43. D

    Young's double slit experiment?

    Two small loud speakers A and B are positioned 1.5m apart in a large room, connected to the same signal generator. The frequency emitted is 3400Hz . A microphone is placed equidistant from the 2 loudspeakers. The perpendicular distance between the speakers and microphone is 9.0m. Calculate the...
  44. A

    Diffraction: Intensity in the double slit situation

    Hello. I have been studying interference and diffraction and one doubt has appeared. When you consider the double slit experiment forgeting the effects of diffraction you get the following equation for intensity I^{}=4I_{0}cos^{2}(\frac{πdsin(θ)}{λ}) where d is the distance between the...
  45. A

    Intensity - Double slit diffraction

    Hello. I have been studying interference and diffraction and one doubt has appeared. When you consider the double slit experiment forgeting the effects of diffraction you get the following equation for intensity I^{}=4I_{0}cos^{2}(\frac{πdsin(θ)}{λ}) where d is the distance between the slits...
  46. D

    Double slit experiment with smoke particles

    Homework Statement Suppose we wish to do a double slit experiment with a beam of the smoke particles of Example 4.1c (which is lamda=6.6e-20m). Assume we can construct a double slit whose separation is about the same size of the particles. Estimate the separation between the fringes if the...
  47. nukeman

    Double slit and psychology? General question.

    Hi guys, Please excuse me, I do not know a great deal about Quantum physics. First, tell me if I am correct. If we shoot electrons at a double slit plate, and we do not watch or "observe" it, it will show a pattern similar to a wave pattern. But, if we record it, or observe it, it will...
  48. J

    Building the CRT's for the Double Slit Experiment

    Hello, my name is Jordan Heath. I am a UBC third year student in the department of physics and am new to this forum. Me and a couple friends are looking into the possibility of constructing the double slit experiment and are currently wondering if it is possible to salvage a pair of CRT's from...
  49. A

    Young's double slit experiment with one slit covered with block of refractive index

    Homework Statement The interference pattern formed is given by I(θ)=4I0cos2(∏dsin(θ)/λ). For d=1×10-5m and λ=500nm plot the intensity pattern as a function of θ for small θ. How would this change if a block of material of thickness 500nm and refractive index n=1.5 were placed over one slit...
  50. T

    Determine resolution of use by modelling it as single slit

    Homework Statement Model the pupil of the eye using a single slit. If the eye is able to notice changes in intensity of 20% show that it can distinguish two objects separated by an angle of 0.00015 radians if =500nm and diameter=4mm. Homework Equations I=Iosin^2((π/λ)asinθ)/...
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