diffraction

  1. D

    Diffraction Gratings

    Mercury has visible optical spectral lines of wavelengths 422.729 and 422.787 nm. You have an apparatus that allows the light to fall on only 0.800 cm of a transmission diffraction grating. How many lines per cenrimeter does your diffraction grating need in order to resolve the third-order...
  2. F

    Diffraction of solid edge through aperture

    Hi, I am an astronomer working on writing an article about a particular diffraction effect seen when a planet is imaged through a telescope. I wondered if anyone has any theoretical workings or references about the effect that I could add to the article. When a hard-edged planet is imaged...
  3. L

    FRESNEL DIFFRACTION DERIVATION THAT est. the wave theory of light

    Fresnel derives a diffraction intensity equation by summating the interfering light waves' amplitudes, at the diffraction screen, using a line integral (equ 1). "Hence the intensity of the vibration at P resulting from all these small disturbances is { [ ʃ dz cos (π z2 (a + b) /...
  4. U

    I don't understand diffraction

    So, I learned about diffraction in physics class, and I must say it's a bit of a mystery to me. Here's the deal: I was told whether or not a wave diffracts through a gap in an obstacle depends on the size of the obstacle relative to the wavelength. However, given a wave is technically a...
  5. kelsiu

    x-ray diffraction of crystals

    In explaining x-ray diffraction of crystals, usually the approach is to consider the atoms absorb radiation and scatter it, at some angles constructive interference occur and bright spots can be observed. It seems that it is different from the diffraction of slits or gratings because in...
  6. kelsiu

    Question about dark fringe in diffraction

    In finding the angle for the mth dark fringe of single slit diffraction using Huygen's principle, they usually split the slit into equal portions. For example, to find the first dark fringe the slit is split into two equal spacings and if the path difference between the edge and the middle...
  7. P

    why young couldnt observe diffraction while doing double slit experiment.

    After going through diffraction and interference pattern(theoretical) due to a double slit I am wondering although the set up is same why are the patterns different.is it because for diffraction to take place the slit width needs to be comparable with the wavelength of light?? What do you think...
  8. P

    X-ray diffraction help

    X-ray diffraction data were collected from PbS. The material is cubic, with four formula units per unit cell. The first eight lines in an X-ray powder diffraction trace correspond to the following reflections: 111, 200, 311, 222, 400, 331 and 420. The ratio of intensities for the 420 and 331...
  9. E

    Diffraction Grating

    Does anyone know the explanation of this question?
  10. B

    capturing diffraction images of light through pinholes

    Hi, I am conducting an experiment and i am displaying diffraction images of light through 2 pinholes on a DSLR camera. I get a good image with lasers but when I capture images of chromatic light i only get the top half (semi circle) image. can someone explain to me why this occurs? I think...
  11. E

    Diffraction grating

    I came across this question: A pupil suggests that a more accurate value for the wavelength of the laser light can be found if a grating with a slit separation of 2x10^-6m is used (it was formerly 5x10^-6m). Explain why this suggestion is correct. I kind of understand but don't know how to...
  12. K

    Diffraction angle

    I am completely stumped on the following question: Sound exists a diffraction horn loudspeaker through a rectangular opening like a small doorway. Such a loudspeaker is mounted outside on a pole. In winter, when the temperature is 273 K, the diffraction angle θ has a value of 12 degrees...
  13. Z

    Diffraction in water

    Hi Could someone explain to me... if a diffraction experiment that had a plane grating on it was submerged into water...why the diffracted light would produce extra angles that are wider and narrower than if the experiment had been carried in air? Does it have something to do with refraction...
  14. S

    Diffraction through Grating

    Hi, I performed the diffraction grating experiment in the Physics Lab a few days ago and obtained the folowing measurements. The aim was to find the number of slits on the grating given the wavelength of laser employed. I find the readings coherent among themeselves but incoherent as a whole...
  15. L

    single slit diffraction

    What happens to the distance between fringes as the width of the single slit become larger? Does the distance between fringes increases? What happens to the centre bright fringe? Does it become larger with an increasing single slit width? My hunch is: Increasing the width increases the size of...
  16. A

    Double slit diffraction

    Ello, This is my question, In a double slit experiment using monochromatic light and two slits 0.50mm apart, it was found that the second dark band was 3.6mm from the centre of the central maximum on teh screen. If th screen was 1.9m from the slits, what was the wavelength of the light used...
  17. L

    Single-Slit Diffraction

    Hi everyone. I need help comprehending single slit diffraction. I am using the textbook: College Physics by Serway / Vuille 8th Edition. This is what it says: "To analyze the diffraction pattern, it's convenient to divide the slit into halves, as in Figure 24.17 (picture below). All the waves...
  18. G

    Colours in a bubble and neon lighgt through defraction grating

    1. Colours can be seen moving around in a blown soap bubble. Explain how these are formed and why they move. 2. Viewing a neon advertising sign through a diffraction grating one sees specific lines of different colours. Give an explanation of how these lines are formed. c= 3x10^8 ms...
  19. M

    What double slit maximum is closest to the 2nd single slit secondary maximum

    A monochromatic light incident on a double slit. lamda= 577nm, d=228 micrometers, L=4.8 meters, slit width a= 37.2 micrometers, and y=15.0cm for 2nd single slit minimum. Note: DS - Double Slit SS - Single Slit - One question asked to find how many DS maximums lie within the 2nd SS...
  20. P

    Helium-Neon Laser / diffraction grating / - two questions!!!!

    Hello, I have managed to get through a whole pile of questions, but I’m stuck with the last two. I would very much appreciate step by step solutions to these problems (a number of parts to each question...); I've scanned them and uploaded them to flickr.com. See link below. I've also attached...