What is Slit: Definition and 1000 Discussions

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. P

    Calculating Width of Single Slit Diffraction Pattern

    Homework Statement The central bright fringe in a single slit diffraction pattern from light of wavelength 412 nm is 1.9 cm wide on a screen that is 1.05 m from the slit. How wide is the slit? Homework Equations i keep trying the equation .5asintheta=.5wavelength I can't seem to...
  2. B

    How Is Fringe Spacing Calculated in a Double-Slit Experiment?

    1. The distance between two slits is 0.0500 nm and the distance to the screen is 2.50 m. What is the spacing between the central bright fringe and the first-order fringe? Use yellow light with a wavelength of 580.0 nm. Answers: a. 0.010m b. 0.029m c. 0.290m d. 0.10m e. 0.6m 2. y =LtanΘ...
  3. J

    Electron double slit diffraction with unequal widths

    Homework Statement Hey guys, I'm working on a problem with a double slit electron diffraction experiment. There is a beam of electrons shooting through two slits onto a screen. When only slit 1 is open, the number of electrons hitting the screen is 25 times the number of electrons hitting...
  4. D

    Can Math Prove Lim f(x)*g(x) Convergence/Divergence?

    if i have a lim of f(x)*g(x) can i say it is limf(x)*limg(x) like i could if i had lim of f(x)+g(x), more specifically, in my homework i have a question where, lim f(x) converges x->inf lim g(x) diverges x->inf and i am asked about convergence of lim u(x) when 1) u(x)=f(x)+g(x)...
  5. P

    Fair dice and two slit experiment

    The number that comes up on a die seems to be determined by mechanics - not probability; eventhough dice are used to explain probability. Is there a analogus process that determines where a photon will fall in the double split experiment - eventhough it is explained by probability?
  6. P

    Optics - Double Slit Irradiance of Fringes

    [Solved] Optics - Double Slit Irradiance of Fringes Homework Statement A double slit diffraction pattern is formed using mercury green light at 546.1nm. Each slit has a width of 0.100mm (= b), slit separation is 0.400mm (=a). The pattern reveals that the fourth-order interference maxima are...
  7. S

    What Causes the Expansion of Our Universe?

    first of all I am from israel so I am sorry for the bad english :P ok.. in the duble slit expreminet when u open 2 slits the elctron go through them both.. and u place a measure device it shows that the electron go only through 1 slit.. but let's take a camera that films through which slit...
  8. F

    Question about double slit experiment

    i've always been curious...WHY did somebody come up with the experiment? why did they think anything special would happen? hope this doesn't sound stupid :)
  9. Y

    Two slit diffraction, neutron, kinetic energy

    hi again folks. this week's set of problems is getting my goat. here's another I can't seem to figure out. Homework Statement In a neutron two-slit diffraction experiment, the slits are 65 µm apart. If the third diffraction maximum is detected at an angle of 2 multiplied by 10-7 rad, what...
  10. T

    Double Slit Interference (nonzero slit width)

    Homework Statement A mask with 2 slits is illuminated by a light of 589nm wavelength. Slits each have a 0.1mm width separated (centre to centre) by 3.0mm. Calculate the distance between adjacent bright fringes on the screen if a screen is placed 5.0m away from the slits. Homework...
  11. R

    Young's double slit experiment beams

    Homework Statement In a Young's double slit experiment, a pair of slits is encased in a rectangular block of glass (n=1.52), and glass block is surrounded by air, as shown below. The glass block is illuminated by coherent light (k = 660 nm) from a laser, as shown. The beam enters the block at...
  12. daisey

    Photons and Double Slit Experiment

    I read that quantum particles (like photons) travel as waves of probability, but when they encounter other quantum particles, the probability waves break down, and the photons assume properties of particles. An example given of this is: if you fire a single photon from point A, to a point B...
  13. P

    Double slit and quater wave plates

    Just a bit confused/ need confirmation of what's happening. We shine light at the double slit and see interference patterns. Place two opposite 1/4 waves plate, so that we have which way information, in front of the slits. This causes the pattern to disappear. 1. Under what condition does...
  14. N

    Solving Doublet Slit Problem: Find Wavelength of Laser 2

    Homework Statement A laser with wavelength d/8 is shining light on a double slit with slit separation 0.350 mm. This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits. What is...
  15. R

    What is the approach for finding fringes on a screen with three slits?

    Homework Statement There are three slits in a screen, with one aligned with the source at z=0, one a distance a above 0, and one a distance b below 0. Another screen is at a distance d >> a,b from the first. What is the periodicity of fringes on the screen? Homework Equations \Delta \phi =...
  16. P

    Double slit photon deflection

    What is the force that acts on a photon that causes its path to deflect when the second slit of the double slit experiment is opened? Assuming that my understanding of the experiment is in the ball park. With one slit open the photon lands in one place but with two slits open it lands in...
  17. S

    KE of Electrons to give same theta as light in double slit diffraction

    Homework Statement Coherent light is passed through two narrow slits whose separation is d. The second-order bright fringe in the interference pattern is located at an angle of theta. If electrons are used instead of light, what must the kinetic energy of the electrons be if they are to...
  18. I

    Youngs double slit exp.

    Homework Statement In a Youngs dbl. slit experiment using green light the fringe width was observed to be 0.20mm.if red light replaces green light,what will be the fringe width? Homework Equations hmm lambda=ay/d but (no info is given on rest)=/ wavelengths:green=5.2x10^-7m...
  19. V

    Homework help w/ youngs slit problems

    I have a couple problems that I'm just not getting. Can someone help me out with these? Problem 1 Homework Statement A two-slit pattern is viewed on a screen 1.12m from the slits. If the two fifth-order minima are 78.5cm apart, what is the total width of the central bright fringe...
  20. Z

    Why is light from a single source incoherent?

    Just a quick q, My book says that to make the light source young used to be coherent, he passed it thru a SINGLE slit THEN passed it thru a double slit. Why would he do that? couldn't he just put the light source directly to the double slit? I thought all light from a single source was...
  21. M

    Double Slit Experiment: Polaroid Films & Wave Function Collapse

    Lets say that I were to perform the double slit experiment so that at anyone time only a single photon passes through the double slit at a time. Now let's say that I were now to place a polaroid film over each of the slits so that each piece of the film was orthogonal to the other. Now in front...
  22. W

    Double Slit Experiment and Electron Spin

    Can anyone direct me to any version of the double-slit experiment which used only electrons with aligned spin axes? If you can't direct me to an experiment, can you postulate how or if the double-slit experiment might be different using such electrons? Thanks!
  23. A

    Questions about the Double Slit Experiment

    As I'm not learning quantum mechanics formally in a classroom, I have no real experience with the matter, or a teacher to whom I can pose my questions. There are a few experiments I'd like to run as well, but no way to do so. In any case, I'm hoping that someone else has run these experiments...
  24. S

    Double slit experiment spacing

    Homework Statement Light from a helium-neon laser (wave length 633 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 3.1 m behind the slits. Twelve bright fringes are seen, spanning a distance of 50 mm What is the spacing, in mm, between the slits...
  25. C

    Recreating Thomas Young's Double Slit Experiment

    I need to recreate this experiment. It doesn't have to be exactly the same, nor does it have to use very high tech and expensive equipment, it just has to be able to demonstrate interference patterns created by light. I cannot find any specifications on how to build this experiment, and I don't...
  26. C

    Double slit and thin film interference

    While completing my problem set for this chapter, I came across 5 problems I could not solve. I thought it might be rather annoying if I posted six posts, so I'm putting all my work and such here. I don't expect one person to try to help me with all of them, just one or two at a time will do...
  27. D

    Single Slit Exp: Find Number of Minima in 0-19deg Range

    A single slit with width 819 nm is illuminated with light of wavelength 405 nm. How many minima occur in the angular range from theta = 0 to theta = ±19deg? I have an exam tomm please help me out with some problems. actually, i hv the answer but i don't know how to derive it!
  28. F

    Another annoying double slit question

    I was hoping to get some comments on my interpretation of the double slit experiment. I realize that this is a bit long, and probably not worth the effort to read, much less reply, but if anyone cares to give me some feedback, I'd appreciate it. I'm trying to wrap my brain around the whole...
  29. T

    Young's Two-Slit Exp: Calculate OP w/ Wavelength 6.0*10^-7 m

    S1 and S2 are two coherent sources of light in a Young's two slit experiment separated by a distance 0.50mm, and O is a point equidistant from S1 and S2. O is on screen A which is 0.80m from the slits. When a thin parallel-sided piece of glass G of thickness 3.6*10^-6 m is placed near S1...
  30. F

    Simple double slit question

    I have a very basic question about the double slit experiment. Some websites that I have seen state that the simple act of measuring which slit the particle goes through, is enough to collapse the wave function, and it isn't necessary for anyone to actually observe the results of that...
  31. S

    Double Slit Experiment: Does Slit Thickness Matter?

    Hi A question that came up today that I do not know how to answer. We were discussing (High School) the double slit experiment and that electrons show interference patterns too. A student asked if the thickness of the double slit slide mattered. ie if the slits were a metre deep ... would...
  32. N

    Double Slit Experiment: Is Observation Equipment Interfering?

    I have a problem with the outcome of the Double Slit experiment , in that it was concluded that when under observation the electron particles behaved differently to when not directly under observation - conclusivly stating that it was the ACT of observing that changed the electron behaviour in...
  33. B

    Two Slit Experiment Setup and Variables

    The 2 slit experiment is common, but what exactly is the complete setup. i know the interference patterns, but there are variables in every experiment. Where is the particle fired? Is it fired precisely at one of the slits, or is it fired so that it should hit in between the two slits if...
  34. S

    Youngs Double Slit: Intensities at Maxima & Minima

    Homework Statement In a youngs double slit experiment,if the slit widths are in the ratio 1:2,the ratio of intensities at maxima and minima will be ? Homework Equations The Attempt at a Solution
  35. N

    Two slit interference pattern

    http://img504.imageshack.us/img504/3341/img186je6.th.jpg Above is an image scanned in from my textbook of an interefernce pattern from two slits. Am I correct in thinking that the distance between the maxima within the main envelope is found via λ = ws/D , where w = this distance...
  36. S

    Slit diffraction with a beam of spatially distributed intensity

    Homework Statement I have the classic slit-diffraction experiment, where light is incident on two narrow slits on a screen and is diffracted to create a pattern of maxima and minima on the far surface. It is usually assumed that the light incident on the slits is uniform. In practice, the...
  37. M

    Calculating Velocity at a Specific Point on a Curved Slit

    Homework Statement The shape of the arch is defined by a sine function with a = 0.2 and the width of the arch is 1m. The velocity v is constant at 2m/s. What is the velocity at point P when x=0.25m? The Attempt at a Solution So since v is just in the x-direction, I figured that's the vx...
  38. Artlav

    Double slit experiment: counter?

    I've been thinking about the double slit experiment - the one with single photons going thru two slits forming an interference pattern never the less. Now, one thing i was unable to find clarification for is the claim that placing a detector even in just one of the slits to find out thru...
  39. K

    How to find intensity in double slit

    1. Homework Statement the two slit of a double slit each have a width of 0.140mm and a distance between centers of 0.840mm. what the approximate intensity of orders m=o to m=6? 2. Homework Equations i want to use the I/Io = (E/Eo)^2 but some book use I = 4Ao^2sin^2...
  40. D

    Young's double slit and interference maximums

    Homework Statement In a Young's double slit experiment the width of each slit is a, the distance between the centers of the slits is d, and the 10th interference maximum to the right of the central maximum is the first missing maximum. a) Find the ratio of the slit separation distance to the...
  41. K

    Double slit and colored wavelength

    Homework Statement White light spans the wavelength range be- tween about 400 nm and 700 nm. If white light passes through two slits 0.656 mm apart and falls on a screen 1.7 m from the slits, what is the distance between the first-order violet and the first-order red fringes? Answer...
  42. K

    How can I prove the identity using Taylor's expansion?

    Homework Statement Three slits of width a and d (separation of adjacent slits). d << the distance to the screen. Show that the intensity we observe is I (\vartheta) = I_{1} \left[1 + 2 cos \left(\frac{2 \pi d sin\vartheta}{\lambda} ) \right] ^{2} 2. The attempt at a solution...
  43. C

    Two Slit Interference Question =] Thanks

    Homework Statement Monochromatic light of wavelength 656 nm is normally incident on a vertical plate with two slits at positions +-d/2 where d=.25mm, the resultant interference pattern is observed on a screen at distance D= 3.4m away, let y denote vertical position on the screen with y=0 at the...
  44. 6

    How far is the screen from the slit? Diffraction problem.

    Homework Statement The distance d from the center of the pattern to the location of the third diffraction minimum of the red laser is 4.05 centimeters. The wavelength of the red laser is 633 nanometers and the slit is 0.15 millimeters wide. How far is the screen from the slit? Homework...
  45. S

    Electron double slit experiment in bubble chamber

    We will not get an interference right? Why? Because the electron interacts with the system? Or the "measurement" forces the wave function to collapse? What if we put a black cloth on the chamber and only see the photographic film? What if we place the chamber before the slits. What if we bring...
  46. O

    Double slit and observation

    Am I correct in thinking that the act of observing which slit a "particle" goes through causes the wave function to collapse, ergo making the source of the "particle" we detect on the back screen to actually be on our detection side of the slits rather than the emitter side? I've drawn it, in...
  47. J

    Dual Slit Experiment: Detecting Photons/Particles?

    hello - I wonder has anyone tried to place a detector for (photons/particles) just as they leave the emitter. If so does the wave like behaviour disappear?
  48. Q

    Huygens principle and single slit diffraction

    How can empty space act as individual point sources as in sinle slit diffraction?
  49. K

    Comments on Double Slit Experiment for Accurately measuring distances?

    I'm thinking about using two slits, a webcam and a laser to calculate distances for a project. Usually you measure the distances between maxima but this can be easily measured in a dark room using Matlab and it's image processing routines. I can create the slits and accurately measure them...
  50. D

    Entanglement and the double slit experiment

    Hello, I'm wondering how the two slit experiment interacts with entanglement. Here's an ascii art picture of the standard two slit experiment: | | | | #...
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