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. T

    Shooting humans through a giant double slit experiment

    Lets say some aliens scaled up the two slit experiment to an enormous size. It is so large that shooting 100kg masses of carbon through the slits creates a diffraction pattern. The aliens then decide to replace the carbon with some captive humans and shoot them through the slits to see what...
  2. O

    Calculating Wavelength of Laser Diffracted by Slit Patterns

    Homework Statement I am to calculated the wavelength of the laser I shone through different slit patterns to create diffraction patters on a screen. For the single slit diffraction, Data: xm is the distance from the central image to the mth minimum. x1 0.008 x2 0.015 x3 0.023 x4...
  3. S

    Slit for the Double Slit Experiment

    I was wondering where could I get a slit for the Double Slit Exeriment that I am trying to do.Thanks
  4. O

    Diffraction Grating, Maxima, finding slit seperation

    Homework Statement Light of wavelength 680 nm is incident normally on a diffraction grating. Two adjacent maxima occur at angles given by sin θ = 0.2 and sin θ = 0.3, respectively. The fourth-order maxima are missing. (b) What is the smallest slit width this grating can have?Homework...
  5. P

    Double slit interpretation - what is the mainstream view?

    Can someone summarise what is the currently accepted interpretation of how measurement affects the interference pattern in a double slit experiment? (Answers which say things like 'the electron knows if it is being observed' are not acceptable - :-) ) To quote from the PF rules, I'm looking for...
  6. T

    Two slit experiment - variable detector

    I have a question about the situation with the two slit experiment where detectors are placed by the two slits to determine which slit the particle has gone through (and destroy the diffraction pattern). Okay, so what I'm wondering is what happens if the detectors' accuracy is not fixed, but...
  7. M

    Question on wavelength using the two slit experiment

    Homework Statement Red light with wavelength of 700 nm is passed through a two slit apparatus. At the same time, monochromatic visible light with another wavelength passed through the same apparatus. As a result most of the pattern that appears on the screen is a mixture of two colors...
  8. V

    Dual slit experiment: closing/opening a slit after the particle passes it. .

    Hello everyone, I recall reading some time ago about an extension to the dual-slit experiment, where researchers either closed or opened a 2nd slit after the particle passed the slit but before it hit the detector. Does anyone know about this research, like the results, and who performed...
  9. M

    Why Is My Calculation of Slit Width Using Light Diffraction Incorrect?

    [b]1. When blue light of wavelength 450 nm falls on a single slit, the first dark bands on either side of center are separated by 51.5°. Determine the width of the slit. [b]2. sin\theta=\lambda/w [b]3. w=450e-9/sin(51.5)=5.75x10-7 I tried this but it said it was wrong, if...
  10. DaveC426913

    Double slit experiment - with molecules?

    I was browsing about the double slit experiment and found the following tidbit on Wiki: (emphasis mine) I knew that electrons could interfere with themselves - I understand how an electron can act like a wave. Even an atom I can understand. But a molecule? This isn't merely suggesting...
  11. O

    Young's Double Slit - Fringe Width

    When measuring the fringe width of a superposition pattern from a monochromatic source - I am using a laser. What problems/inaccuracies could I have when measuring it?
  12. S

    Young's Double Slit: Phase Shift by π/2?

    What happens to a light wave when it is reflected off the surface of a material with a higher index of refraction? a. It reflects with its phase shifted by π. b. It reflects with its phase shifted by π/2. c. The phase shift is proportional to the angle of reflection. d. It...
  13. Q

    Single slit diffraction interference

    erm anyone knows why for destructive interference to occur for a fraunhofer's diffraction pattern, the equation is a/2sin(theta) = m(lamda)/2 , ==> sin(theta) = m(lamda)/a ? where a = slit width lamda = wavelength theta = angle the ray makes with the central axis the problem i have...
  14. P

    Find Wavelengh - Young't Double Slit

    Homework Statement For light from a discharge lamp, the first-order bright fringe is observed at a perpendicular distance of 2.35cm from the mid-point of the slits, when the slit-to-screen distance is 1.2m and the slit separation is 0.03mm. What is the wavelengh of the light from the lamp...
  15. T

    2 Questions on superpostion (Double slit experiment)

    Question 1: Why is it required for the slit separation to be at least one wavelength in the double slit experiment? Question 2: Why do we need to place a single slit before a double slit in the double slit experiment? Thanks in advance
  16. V

    Double slit - where do they aim?

    I could not find any explanation or illustration where it is shown where do they actually aim electron gun (or something) in the version of the experiment where they shoot electrons one-by-one. I suppose this is how original setup looks like: ====================screen== \ / \ /...
  17. D

    How Does Reflection Affect Radar Signal Interference at Sea?

    Homework Statement A radar tower sends out a signal of wavelength lambda. It is x meters tall, and it stands on the edge of the ocean. A weather balloon is released from a boat that is a distance d out to sea. The balloon floats up to an altitude h. In this problem, assume that the boat and...
  18. U

    Calculating slit width by length difference of 1st and 2nd minima

    Homework Statement What is the slit width? Wavelength is 635 nm. Distance between screen and slit, 2.5 m. Distance on screen between first and second minima above the central maxima is delta 6 mm. Homework Equations D* sin theta * = m * lambda tan theta = x/ distance between screen...
  19. A

    Double slit experiment with spin

    Hi everyone, I have a question concerning the double slit experiment that I would like clarified. According to a book I am reading if the electrons passing through slit A are of spin up and the electrons passing through B are of spin down then there will be no interference pattern (just the...
  20. JK423

    Double slit experiment in a Bubble Chamber

    Has this type of experiment ever been performed? Firing electrons one at a time we can easily get the which-path information and see if interference dissapears or not. What actually happens? Also, if we do the double slit experiment with a usual laser but in a smoked environment (in order to...
  21. J

    Double Slit Experiment - Blind Observer

    Hi, I have a question about the famous double slit experiment. They say that if an observer like a camera or a person is watching the experiment then it collapses the wave function and two marks appear instead of an interference pattern. Does anyone know what what happen if a totally...
  22. 0

    How Does a Narrow Slit Affect Laser Beam Divergence?

    what is the effect of placing a slit of say one tenth of an inch infront of a laser beam (3 inch dia )with a divergence of say one degree upon the divergence of the emanating beam?(slit placed symmetrically along the beam axis) ? would the emanating beam also be of the same divergence ?
  23. H

    Young's Light-Double Slit Experiment: Is There a Minimum Ratio?

    I have a question about Young's Light-double slit experiment, is there a minimum ratio between the intensity of the light and the size of the slit or the distance in between the slits to alter the results? For example, if a wall has two open doors into the same empty, standard room and a photon...
  24. C

    Thomas Young's Double Slit Experiment

    I have to recreate Thomas Young's Double slit experiment and take pictures of the interference patters for a research paper. My teacher has a powerful red laser at school that I can use, though i know that the interference pattern changes with the changing frequencies. I was wondering if a 5 mw...
  25. U

    Questions about variations on Double Slit experiment

    I've been wondering about the implications of this experiment and have a couple of questions about variations that I'm wondering if anyone has done. (I did not find any examples of these variations elsewhere). 1) In this variation, you have the photon pass through the slits twice. First...
  26. E

    Purpose of Entrance Slit in Spectrometer: Rgds Evidenso

    Hi Can anyone tell me the purpose of a entrance slit in a dispersive spectrometer. What is it good for? I guess it will create a single slit diffraction pattern. Why will this make the resolution better, instead of just colliminate the beam? Will the slit do some kind of Fourier filtering...
  27. R

    Young's Double Slit experiment

    Hi all I have a doubt on this The experiment per se does not say anything wrt to the size of the slit right? Now my question here is, if i actually reduce the size of the slit to such a size that only one atom of a particular gas(say helium) can pass through this Now let us say i...
  28. W

    Single Slit Interference: Explaining the Phenomenon

    Single slit interference. ?? Can someone please explain to me about the single slit interference phenomenon? My teacher said that after passing through the slit, it can be modeled that there are two wave source coming form each end of the "wall" which makes the slit. How can this actually...
  29. K

    Young's double slit experiment

    please can you lookm at my video on youtube and give comment,if you think I am mad say so,if you think it looks right please say so (it isn't a spam video just what i think is missing from the experiment that's all) http://www.youtube.com/watch?v=hG_vNk-TJOs&feature=channel_page
  30. K

    Is therte any one who wants to chat about my problems with youngs 2 slit experiment ?

    is there anyone who wants to chat about it ? iv tried once here and got not 1 reply, not even the YOU HAVE DONE IT WRONG please if you think I am wrong say so and have a chat, youngs experiment was to do with light nothing more right or wrong ? iv brought over 15 cheap lasers and broke most...
  31. H

    Wave optics YOUNG'S DOUBLE SLIT EXPERIMENT

    Hi, I'm encountering problems in my tests about young's double slit experiment and in many of those I'm finding the source executing simple harmonic motion (whose equation is given ) and we are asked to calculate the equation of motion of central bright fringe,max no. of fringes that can be...
  32. T

    Double slit experiment, question on when the path is determined

    double slit experiment, question on when the path is "determined" Hi all, question here from a non-scientist. Let's say I set up a double-slit experiment, with a detector at one or the other slit. I get it working, so that when I am able to determine the particle path, the interference...
  33. K

    Youngs two slit experiment problems

    can anyone give imput please,i have a problem with Youngs two slit experiment,if i remove the lens from the laser,you just get the 2 slits, iv got a few videos of it on youtube you might find strange
  34. B

    Double slit experiment and wavelengths

    Homework Statement A double-slit experiment is performed with light of wavelength 558.0 nm. The bright interference fringes are spaced 1.84 mm apart on the viewing screen. What will the fringe spacing be if the light is changed to a wavelength of 335.0 nm? Homework Equations d=...
  35. R

    Double Slit, different wavelengths change in X

    Homework Statement Two slits are 0.158mm apart. A mixture of red light (wavelength = 665nm) and yellow-green light (wavelength = 565nm) fall onto the slits. A screen is located 2.2m away. Find the distance between the third-order red fringe and the third-order yellow-green fringe...
  36. P

    Bohmian Mechanics and the two slit experiment

    I am trying to understand the essentials of the Bohmian interpretation of quantum mechanics (BI),and my (many) difficulties start with his description of the two slit experiment.As I understand it,Bohm asserts that every quantum particle has associated with it a quantum potential or guiding...
  37. V

    How Does Light Intensity Vary with One Slit in a Diffraction Experiment?

    If one slit is used instead of 2 in a diffraction experiment, how does light intensity vary? I think.. Central fringe brighter, symmetrical fringes either side of central fringe, central maximum twice the width of side fringes.. But I'm not sure why? Also, using diffraction gratings –...
  38. I

    Single slit Diffraction using green light

    Homework Statement Monochromatic green light of wavelength 546 nm falls on a single slit with a width of 0.095 mm. The slit is located 75 cm from a screen. How wide will the central bright band be? Homework Equations D sin 0dark = m 入 The Attempt at a Solution Can...
  39. P

    Finding Slit Separation Using the Double-Slit Apparatus

    Homework Statement The green line of gaseous mercury at 546nm fals on a double-slit apparatus. If the fifth dark fringe is at 0.150 degree from the centerline, what is the slit separaton? Homework Equations d sin (theta) = m* lambda The Attempt at a Solution ok i used the...
  40. B

    Double Slit Question: Wave Behavior Explained

    There is something I never understood in the double slit. Here is a picture. http://www.physics.colostate.edu/users/pavol/anims/physics/double_slit.gif When the particle is emitted from a source, if it truly acts like a wave, then wouldn't it sometimes hit the wall in-between the slits...
  41. M

    Calculating Single Slit Diffraction Width with 630 nm Light

    Homework Statement A single slit is illuminated with 630 nm light, and the resulting diffraction pattern is viewed on a screen 2.8 m away. If the linear distance between the first and second dark fringes of the pattern is 12 cm, what is the width of the slit? Homework Equations y=Ltan\theta W =...
  42. W

    The Young's double slit exp. and some general waves

    I was reading about the classic Young's double slit experiment and I had a few questions regarding secondary wavelets a.k.a Huygen's wavelets. I proceed with the following questions assuming you know the experiment. The crucial point behind the explanation to the experiment is that light...
  43. PRODOS

    Bohmian Mechanics: Do photons travel faster than c in double slit experiment?

    In the double slit experiment, Bohmian Mechanics http://plato.stanford.edu/entries/qm-bohm/#2s" the paths of real particles traveling from the two slits to the detector to look like something like this: The above image shows particles traveling in non-straight paths. The diagram below...
  44. N

    Angular Position of 1st Dark Fringe in Two-Slit Interference Pattern?

    Homework Statement A blue laser beam of wavelength 470nm (in air) is incident on two narrow slits separated by .2mm and produces an interference pattern on a screen located 2m away from the two slits. Find the angular position (in degrees) of the 1st dark fringe. Can you use the small angle...
  45. L

    Understanding Double Slit Interference: How Do We Count Fringes?

    Homework Statement When they say the first and third bright fringe, do they mean m=1 and m=0..do we count m=0? And likewise for when they say first and third dark fringe, is it m=1.5 and m=3.5? How would we know when to count m=0? Thanks Homework Equations The Attempt at a Solution
  46. L

    Intensity of Double Slit Pattern

    Homework Statement Could anyone help me to explain how the intensity of the double Slit pattern works because I'm looking at the formula and I'm really confused...Homework Equations I=4Icos^2(phi/2) A=2Ecos(phi/2)The Attempt at a Solution
  47. T

    Double Slit Experiment Near The Singularity of a black hole

    I've been wondering for a long time whether or not the theory that one electron can be in two places at the same time holds near the singularity of a black hole?
  48. R

    Double Slit Interference and linear distance

    Homework Statement In a double-slit interference experiment, the wavelength is 579 nm, the slit separation is 0.12 mm, and the screen is 30.0 cm away from the slits. What is the linear distance between adjacent maxima on the screen? [Hint: Assume the small angle approximation is justified and...
  49. X

    Young's double slit experiment decreasing distance

    what the advantage of decreasing the distance between slits in a Young double slit experiment? i think to have the laser move closer to the screen
  50. V

    Double slit experiment (one slit closed)

    Hi, In young experiment, say one slit is completely closed, what observed is looks like a single band light. But why is not a diffraction pattern? I wonder whether the reason is, the slit width(don't mean distance between slits) more narrow than single slit diffraction in Young experiment?
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