What is Grating: Definition and 260 Discussions

A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings usually consist of a single set of elongated elements, but can consist of two sets, in which case the second set is usually perpendicular to the first (as illustrated). When the two sets are perpendicular, this is also known as a grid (as in grid paper) or a mesh.

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  1. B

    Diffraction Grating Homework: Find the Distance of Bright Fringes

    Homework Statement You shine a red (λ = 650 nm) laser beam and a green (λ = 532 nm) laser beam at a diffraction grating that has 400 slits/mm to create an interference pattern on a wall 2.30 m from the grating. If the two lasers are directly on top of each other, how far apart are the two m = 1...
  2. T

    Diffraction grating, distances between maxima

    Homework Statement A grating has a line density of 1010 cm−1, and a screen perpendicular to the ray that makes the central peak of the diffraction pattern is 2.5 m from the grating. If light of two wavelengths, 590 nm and 680 nm, passes through the grating, what is the separation on the (flat)...
  3. toforfiltum

    Diffraction grating that gives max intensity

    Homework Statement Homework Equations dsinθ=nλ IαA2 The Attempt at a Solution I chose D because I thought that D gives the max intensity since the amplitudes superimpose over a smaller area. But the answer is C. I can't see why.
  4. Shahab Mirza

    What Angles Reveal Second Order Bright Fringes in Diffraction?

    Hi, 1. Homework Statement Q : A diffraction grating with 10000 lines per CM is illuminated by yellow light of wavelength 589 nm, At what angles is the 2nd order bright fringes seen ?Homework Equations From my textbook , I got this equation , d sin theta = m (λ) The Attempt at a Solution Ok so...
  5. S

    Light problem -- diffraction grating distance between adjacent bright fringes

    Homework Statement Light from a laser with a wavelength of 760 nm is directed at a diffraction grating of 1500 lines/cm. If the diffraction grating is located 1.5 m from the screen, calculate the distance between adjacent bright fringes. Homework Equations Δx = Lλ / d 760 nm = 7.60 x 10^-7 m...
  6. CAH

    Diffraction grating and wavelength

    Hi I've attached the question and mark scheme, I don't understand part 6(d)... Why have they used sin90? nλ=dsinθ If there is another order beam how can it be known the angel at which it exists from the zero order? Thanks
  7. A

    Diffraction grating with high intensity in first order

    I'm searching for a reflexive diffraction grating with at least 1500 line per mm and high intensity in first order. Common reflexive diffraction grating don't have enough intensity for my experiment. I need to help for getting such grating. Thanks
  8. W

    Problem with wave optics - diffraction grating?

    Homework Statement For your science fair project, you need to design a diffraction grating that will disperse the visible spectrum (400-700nm) over 30 degrees in first order. How many lines per mm does your grating need?Homework Equations sin(Θ) = mλ/d y = Ltan(Θ) I'm pretty sure the only...
  9. L

    Diffraction Grating and Dispersion

    1. The problem statement A diffraction grating has a slit separation of 2094.0 nm. What is the dispersion of the 2nd order lines at an angle of 30 degrees (in degrees per micrometer)? Homework Equations dsinΘ=mλ y=(mDλ)/d 3. Attempt at a solution I began by finding λ using the first...
  10. S

    Does a diffraction grating with a shape form fourier image

    i just wanted to get this cleared that a beam falling on a diffraction grating with a shape gives the Fourier images of the grating object which can be reobtained by placing a biconvex lens that would converge the rays and form a focussed Fourier image at its focal length and the image of the...
  11. A

    Minima of a diffraction grating

    Note from mentor: This thread was originally posted in a non-homework forum, so it does not use the homework template. -------------- We have n slits, however suppose half of the middle ones are covered. How could you go about finding the angles at which the minima occur at in the Fraunhofer...
  12. L

    +1 order efficiency in a blazed transmission grating

    Homework Statement I have a blazed transmission-grating with a known blaze-angle θB and refractive index n. Is there a way (as with a blazed reflection-grating) to calculate at what incident angle maximum efficiency will be achieved for the m'th order diffraction given a wavelength? Edit: Of...
  13. Gilbert

    FBG Wavelength Reflection in Double-Clad MMF for 910 nm Laser Diode

    Hi everyone! I use a FBG in a double-clad multimode optical fiber of 20 µm core diameter, and a laser diode working at 910 nm as ligth source. As the Bragg reflection wavelength of a FBG depends on the effective refractive index of the different guided modes (λFBG=2.neff.Λ , where Λ is the...
  14. G

    Diffraction Grating: Does Light Excite Electrons or Pass Through Holes?

    Simple question about this: Say you have a wire diffraction grating. Does the incoming light excite the electrons in the metal, which scatter new light *or* does the incoming light simply pass through the "holes" in the mesh and get absorbed by the grating? I've seen it explained both ways, yet...
  15. N

    Diffraction Grating wavelength

    Homework Statement A beam of light comprises two wavelengths is passed through a transmission diffraction grating. When viewed at an angle of 21.1° to the incident direction, the second order maximum for one wavelength is overlapped with the third order maximum for the other wavelength. The...
  16. A

    What are g and a in a Diffraction Grating Problem?

    Homework Statement A diffraction grating has period D, and each element of the grating consists of a pair of narrow slits separated by D/N where N is an integer. a) Sketch the diffraction pattern when the grating is normally illuminated b)Calculate the relative intensities $I_n$ of the various...
  17. G

    Diffraction gratings and angular separation

    Hello everyone, I came across the following when I was reviewing diffraction gratings: "The condition for maximum intensity is the same as that for a double slit. However, angular separation of the maxima is generally much greater because the slit spacing is so small for a diffraction grating."...
  18. SarahLou

    Diffraction grating and Dirac comb

    Homework Statement I need to measure (with the ruler) the width the depicted sinc envelope and the period of the depicted Dirac comb light pattern. And from the above I need to calculate the width of one slit a (i.e. aperture width) of the grating, and the period of the grating dx (i.e...
  19. Alexandra7

    Determine ruling from grating constant

    Homework Statement If "d" is the grating constant, determine the ruling (number of lines/grooves per meter) "D" Homework Equations I have spent hours researching sites that are far too complicated for my understanding of physics. As a result the only relevant equation I could remotely relate...
  20. Greg Bernhardt

    What is diffraction grating and how does it work?

    Definition/Summary A diffraction grating is formed by an evenly spaced series of lines, slits, or other periodic array of reflective or transmissive elements. It is typically used for analyzing the spectrum or measuring the wavelength of electromagnetic waves, particularly in or near the...
  21. Rookie

    What is the Separation of Two Apertures in a Light Diffraction Grating?

    Homework Statement A source of light shines through two apertures resulting in an intensity distribution pattern on a viewing screen. The central bright fringe is called the m=0 or zeroth order maximum. In the schematic diagram 1, the light source is to the left of the page and the point...
  22. U

    Covering a slit in a diffraction grating - what happens?

    Homework Statement For an N = 1000 slit diffraction grating, the distance from a maxima to a minima at order p is given by: \delta \theta = \frac{\lambda}{Np} The centremost ##\frac{N}{2}## slit is covered, what happens to this width? Homework Equations The Attempt at a...
  23. P

    Near field of a diffraction grating?

    I know one can find the "near field" length of an illuminated diffraction grating by calculating the Talbot Length, but I also know this is not the complete story. What happens when you have instead a light source (like a laser beam) that coherently illuminates a certain number of grating...
  24. B

    Diffraction grating interference

    Hello, I'm having a hard time understanding why diffraction grating spots are narrower than those produced by a double slit set-up. I would really appreciate a conceptual understanding but math works too. Thank you
  25. U

    Diffraction grating, magnification

    Homework Statement Part (a):Sketch zeroth and first order rays. Find the angle of first order rays make to normal. Part (b): Sketch intensity distribution at 7.5mm and 10mm. Part (c): Explain how this is useful in understanding a microscope. Homework Equations The Attempt at...
  26. U

    Grating Spectrometer - Bandpass

    Homework Statement Part (a): Find intensity distribution of N-slit grating Part (b): Find resolving power Part (c): Find an expression for Bandpass, and estimate its value. What value of slit width gives same bandpass as resolving power theoretically? Homework Equations The Attempt at a...
  27. D

    MHB Diffraction Grating: Uses, Light as Particle & When - 65 characters

    What does a diffraction grating do, and what is it used for? Are there circumstances under which light must be considered a particle? When? From wikipedia, diffraction grating is an optical component with a periodic structure, which splits and diffracts light into several beams traveling in...
  28. P

    Diffraction Grating problem (waves and optics)

    Homework Statement Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.58m from the grating. In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 3.16...
  29. N

    How Does Diffraction Grating Reveal CD and DVD Storage Capacities?

    Hello, I have to do an experiment in which I will investigate the diffraction grating of a CD and a DVD. I want to find out the spacing of tracks on both of them and thus find how much information can be stored. Also I want to compare them (density of tracks etc.) and maybe even suggest...
  30. S

    Please help i cant understand anything about diffraction grating

    why should we use a convex lens to focus the rays at the point on the screen.why is at an angle instead of being straight?
  31. U

    Diffraction Grating, focal length of lens

    Homework Statement Light from infinity strikes a diffracting grating normally with 600 lines per mm. The emitted light then passes through a lens to project visible light (400-800 nm) spectrum onto a screen that is 50mm, just enough to cover it. Find the focal length of the lens. Homework...
  32. A

    Diffraction grating: arbitrary incident angle

    Diffraction on 1D grating is covered in many physics books. Usually they cover simple case when incident light is coming along the normal to the grating. Sometimes they present slightly more complicated case when incident light is tilted in the plane perpendicular to the stripes (left case on...
  33. A

    Diffraction grating with monochromatic light vs. white light?

    (A) What kind of pattern of would you get if you shone monochromatic light on a diffraction grating? What pattern of light would you get if you shone white light on a diffraction grating? My answer: With monochromatic light, you would get a pattern of alternating light and dark bands. With...
  34. M

    Single slit double slit and diffraction grating

    Homework Statement 1. From conservation of energy point of view if single and double slits, and diffraction grating had slits of same width, how should their overall light intestines compare 2. under what conditions can we consider double-slits intensities as approximately constant...
  35. E

    What happen when monochromatic light irradiated on reflective grating

    what happen when monochromatic light irradiated on reflective grating? where is the light will be? what is the pattern like? thank you very much! best wishes!
  36. G

    Diffraction grating with slits out of phase

    Homework Statement Describe how the Fraunhofer diffraction pattern of a grating depends on: (a) the spacing between the grating lines; (b) the overall extent of the grating; (c) the amplitude distribution over an individual line; (d) the phase distribution over an individual line. A...
  37. M

    Diffraction grating experiment

    I did an experiment where a red laser went through a diffraction grating The distance between the diffraction grating to the screen is 10cm (x) Later I measure the distance from the central dot to the first dot (4.5cm) (y) after this I measure the distance from the central dot to the second...
  38. D

    Question about Light incident at an angle on a diffraction grating.

    Homework Statement Show that the equation mλ=dsinθ becomes mλ=d[ sin(θ-κ) + sin(κ) ] when the light is incident on the diffraction grating at an angle κ to the normal. Homework Equations The Attempt at a Solution I am not quite sure of the answer (we are just learning this in...
  39. H

    Diffraction grating with combination light

    Green and orange light pass through a diffraction grating that contains 6000 lines/cm. Compare the appearance of the fringe at m = 0 with all the others. So far I've only dealt with light with one wavelength, so I just want to make sure I have the right thought process here for two...
  40. G

    Solving Grating Resolution Homework for Skyscraper Distance

    Homework Statement Considering larger objects, a skyscraper has two tall antennae separated by 3 meters. Each antenna has one blue and one red light. You can resolve the two blue lights but not the red ones. Assume that your pupils have a diameter = 2 mm at night, and that blue light's...
  41. J

    Rebuild Diffraction Grating From Fourier Frequency Components

    I have a diffraction grating through which I shined a 532 nm laser. A detector which can pan 360˚ was rotated around and picked up all of the transmitted diffraction peaks. Shown in the graph graph attached are the intensities of the peaks against the angle. My question is, is it possible to...
  42. G

    Find the Wavelengths of Red and Blue Light in a Grating Spectrometer

    Homework Statement White light illuminates a 2-cm wide diffraction grating at normal incidence. The dispersed light falls upon a viewing screen. The entire first-order and second-order patterns are observed. The four arrows in the figure below represent the first- and second-order red and...
  43. M

    Maximums on a Diffraction Grating

    Homework Statement Consider an array of parallel wires with uniform spacing of 1.40 cm between centers. In air at 20.0°C, ultrasound with a frequency of 35.6 kHz from a distant source is incident perpendicular to the array. (Take the speed of sound to be 343 m/s.) (a) Find the number of...
  44. A

    Diffraction Grating Homework: Zeroth & 1st Order Bright Spots

    Homework Statement You shine a green laser pointer (l = 535 nm) on a diffraction grating that contains 1.0 x 104 lines/cm. When projected onto a screen that is 5.0 m away from the grating, how far apart will the zeroth-order and first-order bright spots be? Homework Equations sinθ =...
  45. G

    Multiple Slit Interference and Driffraction Grating

    Homework Statement A five-slit system with 8.4*10-6 slit spacing is illuminated with 610*10-9 light. Find the angular position of the first two maxima, and the 3rd and 6th minima. Homework Equations For Maxima: d*sin(θ) = m*λ θ = sin-1((m*λ)/d) For Minima: d*sin(θ) = (m/N)λ θ =...
  46. K

    Diffraction Grating Angle Between Second Order Maxima

    Hi Everbody, I am having a bit of trouble with an AS Physics question regarding diffraction gratings. I have managed to solve the problem that I have been facing, although I am not completely sure that I got to it through the correct means, and also why the answer is such. Homework...
  47. M

    Diffraction Grating And Lightbulb

    An incandescent lightbulb produces incoherent light. But on Wikipedia, for instance, there is a picture of it producing a rainbow diffraction pattern on the diffraction grating page. But since the bulb is putting out incoherent light, it should be intensities rather than fields that add...
  48. S

    Size of the Diffraction grating ?

    Size of the "Diffraction grating"? Is the size of the "Diffraction grating" related to the sharpness/brightness of the lines of spectrum which are produced by it? Thanks.
  49. Darth Frodo

    Diffraction Grating - Resolving Power

    Homework Statement 4. Light from a mercury discharge lamp contains 2 yellow lines at 577 nm and 579 nm. Find the angle of diffraction for the 577 nm line in second order when passed through a grating having 2400 lines at 80 lines per mm. What is the expected dispersion in second order in the...
  50. J

    Diffraction grating of laser light

    Homework Statement a narrow beam of laser light (i.e coherent monochromatic light) wavelength 630nm is incident on a grating having 300 lines per mm. a piece of paper is curved 180 degrees beyond the grating. calculate how many spots of red light should be seenHomework Equations...
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