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. Nemo's

    Diffraction Grating ( Waves )

    Homework Statement White light is incident normally on a diffraction grating with slit separation d of 2.00x10^-6m. a)Calculate the angle between the red and violet ends of the first-order spectrum. The visible spectrum has wavelength between 400nm and 700nm. b)Explain why the second and the...
  2. O

    Basic formula for diffraction grating

    Homework Statement For the diffraction grating that used to detect the wavelength of a wave, we use d sinθ= nλ. When we find r1-r2 to get nλ. 1) What is the assumption we should make? 2)Then why r1-r2 will get λ?Homework Equations d sinθ= nλ...
  3. T

    Buckyball Diffraction Thru a Grating.

    Homework Statement Buckyballs are soccerball-shaped molecules consisting of 60 carbon atoms (Mass of C60 = 1.2024×10-24 kg) with an approximate diameter of 1 nm. A beam of buckyballs with each molecule carrying a kinetic energy of 0.60 eV is normally incident on a grating with a slit with of...
  4. N

    Grating Spacing With Fourier Optics

    Just ahead of time, no this is not related to homework or coursework in my case. I am a TA for an optics lab and need to know it so I can help the students in my class. I am trying to find an expression for the x-spacing for a grating imaged using the 4f method, which is a grating that is 1...
  5. S

    Reflection Grating: Exploring The Wavelength Dependence

    hi, I am bothered by some question for a long time. From basic optics, i know that the the angle of incidence equals the angle of reflection [where we define the incident angle as the angle between the beam and the normal to the surface of course]. What I can't understand is why when a...
  6. genxium

    [Lab]difference between diffraction grating and linear polarizer ?

    [Lab]difference between "diffraction grating" and "linear polarizer" ? I'm recently looking for optical devices to do some experiments at home, like diffraction and polarization, but when I turn to Amazon for the goods, I found that both the sheets I want are marked: 500 lines/mm -- diffraction...
  7. T

    Holographic grating - can we calculate efficiency for each order?

    Hi, I'm new to working with gratings. From using the basic grating eqn., I'm able to model the diffraction angles for each order with different angles of incidence upon the grating and I can calculate the dispersion given a broadband source with known minimum and maximum wavelength...
  8. D

    How is diffraction affected by grating thickness?

    I would like to talk to someone here who has either theoretical or practical experience with not-too-thin transmission gratings. I have the following problem. I want to compute the far-field diffraction image of an electromagnetic wave (with a wavelength in the visible spectrum) as it passes...
  9. A

    Light wavelength passing through a grating sketch help

    Homework Statement light with a wavelength of 520 nm abd 630 nm passes through a diffraction grating that contains 6000 lines/cm. a) sketch a diagram of the image produced from m=0 to m=2, label the order of each fringe b) calculate the angles for the first and second order maxima that...
  10. A

    Sun's light beam and diffraction grating

    Hello. Lets say we have 2 small holes (1&2) which makes tiny light beam from the Sun's light. (similar to laser beam) ......1|......|2... (Sun) -> >-------------------------------------|dg|-----{order 0}-------(Earth) ......1|......|2... |dg| is diffraction grating perpendicular to the light...
  11. S

    Diffraction grating, number of slits, and intensity

    Homework Statement Got a question in a school examination, but here's the part I want to ask. How does the number of slits per unit length, affect the intensity of the diffraction pattern? What I do know is that the finer the slit separation, the wider the angle opens up. But intensity is...
  12. S

    Solving Diffraction Grating Homework: Max Wavelength at 11°

    Homework Statement A monochromatic plane wave is normally incident on a diffraction grating with 105 lines/m. For what visible wavelengths would this grating produce a maximum at 11°. Homework Equations d*sinθ = m*λ The Attempt at a Solution d = 1 x 10-5 m I don't get how to...
  13. D

    Diffraction grating question

    Question: Light from a slit passes through a transmission diffraction grating of 475 lines/mm, which is located 2.8m from a screen. What are the distances on the screen (from the unscattered slit image) of the three birghtest (first-order, n=1) hydrogen lines for red 657nm, blue-green 486nm...
  14. F

    Fiber bragg grating and pressure

    hello,i just want to know how the fiber bragg grating is being affected by the pressure that act on it? and where is the reference that i can refer to further reading..thanks
  15. Z

    Solving Diffraction Grating Homework Problem

    Homework Statement When a monochromatic light of wavelength 600 nm is viewed 2 m away through a diffraction grating, two similar lamps are observed, one on each side of it, and each 0.30 m away from it. Calculate the number of lines in the grating Homework Equations sinθ = (n*λ)/d...
  16. L

    Diffraction grating, angular with of the intensity peaks to the first maximum

    Homework Statement A diffraction grating is ruled with 500 lines/mm and is 1 mm in width. Calculate the angular width of the intensity peaks to the first minimum in the Fraunhofer diffraction pattern of this grating, when illuminated with light of λ = 600 nm. Homework Equations n-...
  17. majormaaz

    Diffraction Grating and Maximums

    Homework Statement A grating has 728 lines per centimeter. Find the angles of the first three principal maxima above the central fringe when this grating is illuminated with 680 nm light. Homework Equations Our teacher briefly told us that N = # of slits / cm and that d sin θ = mλ, and...
  18. D

    Intensity Distribution of 4 Slit diffraction grating using convolution

    Hi all, I am trying figure out this diffraction problem. I have to find the intensity distribution of a four slit fraunhofer diffraction grating using the convolution theorem. I can do the math and all...but I do not know how to start it! The only information I am given is the slits have...
  19. M

    A Haunting question on diffraction grating

    Homework Statement This question is pretty interesting, but a bit long, so bear with me http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w07_qp_2.pdf question 5 part c For (i) The width of each slit is increased but the separation remains...
  20. M

    Diffraction grating sum, 1 mark mcq question (a level)

    Homework Statement Im having a bit trouble with diffraction gratings lately, with sums like this: A parallel beam of light of wavelength 450 nm falls normally on a diffraction grating which has 300 lines /mm. What is the total number of transmitted maxima? A 7 B 8 C 14...
  21. M

    Calculating the wavelength of a laser? (Diffraction grating)

    Hi, I'm doing a experiment/report on this topic, I'm trying to get a better understanding of the equation "nλ = dsinθ" ALL length measurements are in meters for simplicity's sake. n = bright spot number from the central bright spot (n0) d = distance between slits The angle "θ" and distance...
  22. P

    Solve Diffraction Grating Homework: 500 nm, 1st Order, 20o Angle

    Homework Statement A beam of monochromatic light of wavelength 500 nm falls normally on a diffraction grating. What is the spacing between slits on the grating if a first order maximum is observed at 32o? a. 2.88 m b. 0.944 m c. 0.750 m d. 0.500 m e. 0.250 m Homework Equations...
  23. M

    Aperture function of Diffraction Grating

    Homework Statement A very large diffraction grating has an amplitude transmission aperture function A(x) = 1/2[1+cos(kx)]e^(-x^2/a^2) a) What is the far-field irradiance diffraction pattern when a >>1/k B) Plot the pattern c) Using the appropriate resolving criteria, find the grating's...
  24. M

    Diffraction Grating: Effect of Wavelength Change on Pattern

    What is the effect of change of wavelength on diffraction pattern?Does it effects intensity or fringe width?
  25. M

    How do I find the spacing(d) of a grating in a diffraction grating experiment.

    Homework Statement http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s02_qp_2.pdf question no. 7b Homework Equations dsin∅=nλ The Attempt at a Solution I subtracted the two angles and got 26 degrees. So then I plugged...
  26. A

    The lines in a grating are uniformly spaced at

    Homework Statement The lines in a grating are uniformly spaced at 1530 nm. Calculate the angular separation of the second order bright fringes between light of wavelength 600 nm and 603.11 nm. Answer in __mrad Homework Equations Theta = sin-1 ((m*lambda*2)/(d)) The Attempt at a...
  27. M

    Problem with Diffraction Grating Equation (results do not match theory)

    Hi. The grating equation says n x λ = d sinθ. Where d = 1/N (the nymber of slits per unit length.) Using the equation and solving for a grating with large number of slits gives the result that the diffraction pattern should have a greater angle of deviation from central maximum for...
  28. H

    Monochromator and changing grating question.

    Homework Statement A simple grating monochromator requires the incident light to arrive from the entrance slit at angle "A incident" relative to the "neutral" position, and only light reflected at angle "Aout" will travel through the exit slit. For this monochromator, Ain = Aout = 50...
  29. J

    Solve Diffraction Grating Homework: Freq, Spacing, Angle

    Homework Statement The number of lines per metre in a grating is 500,000, calculate grate spacing. The wavelength of light going through the grating is 600nm, what is the angle of the first order? What is the frequency of the light is it's speed is 3 x 10^8 m/s? Homework Equations The...
  30. P

    How Do You Calculate the Angle for Retroreflection in a Diffraction Grating?

    1. Homework Statement I'm choosing an angle for a diffraction grating such that a laser of particular wavelength λ is retroreflected (reflected back along incident path). 2. Homework Equations If you have a better way than using the equation below, feel free to explain. The book that I'm...
  31. P

    How Do You Set the Angle of a Diffraction Grating for Retroreflection?

    I'm choosing an angle for a diffraction grating such that a particular wavelength λ is retroreflected (reflected back along incident path). The book that I'm looking through treats the blazed diffraction grating as a set of N slits. This results in the equation...
  32. N

    Understanding Diffraction Gratings: Optimal Blazing Angle and Wavelength

    Hi In lab classes today I worked with diffraction gratings, but there is one thing I can't quite seem to understand. If we deal with ruled diffraction gratings, then they are blazed at angle such that the first order is reflected back at the same angle as the incident angle with a specific...
  33. G

    Diffraction grating spectrometer

    Homework Statement Suppose that you have a reflection diffraction grating with n=140 lines per millimeter. Light from a sodium lamp passes through the grating and is diffracted onto a distant screen. How wide does this grating need to be to allow you to resolve the two lines 589.00 and...
  34. A

    Diffraction Grating Overlapping Orders

    Homework Statement The same diffraction grating is used with two different wavelengths of light, λA and λB. The fourth-order principal maximum of light A exactly overlaps the third-order principal maximum of light B. Find the ratio λA/λB. Homework Equations sin theta = m lambda /...
  35. B

    Diffraction grating problem involving two wavelengths.

    Homework Statement A diffraction grating has 4,200 rulings/cm. On a screen 2.00 m from the grating, it is found that for a particular order m, the maximum corresponding to two closely spaced wavelengths of sodium (589.0 nm and 589.6 nm) are separated by 1.54 mm. Determine the value of m...
  36. C

    Diffraction grating angular separation

    Homework Statement Light consisting of two nearly equal wavelengths L and L+dL, where dL << L, is incident on a diffraction grating. The slit separation of the grating is D. Show that the angular separation of these two wavelengths in the m'th order is dTheta = dL / ((D/m)2+L2)0.5...
  37. N

    Diffraction grating & young double slit -light not perpendicular to grating

    Homework Statement I was a asked a question from an experiment: What happens if the light shone into the diffraction grating or a double slit is not perpendicular to the diffraction grating or double slit? What will happen?The Attempt at a Solution Straight away i can tell that the light...
  38. H

    Alternating violet and red fringes in Diffraction Grating

    When white light is passed through the slits in the grate and hits a screen some distance away from the grate, different order spectra appear. My textbook tells me that violet light is always closer to the zeroth order bright fringe than red light because it has a shorter wavelength. However...
  39. V

    Maxima of Diffraction Grating with 300 Lines/mm and Wavelength of 450 nm

    Homework Statement Light of wavelength 450 nm is incident normally on a grating with 300 lines per millimeter. How many orders of diffraction maxima can be obtained? Homework Equations d sin(theta) = n(lambda) The Attempt at a Solution 300 lines per millimeter is 3.33 x 10^-6...
  40. B

    Diffraction grating problems

    A diffraction grating with 600 lines/mm is illuminated with light of wavelength 500nm. A very wide viewing screen is 2.0m behind the grating. b.) How many bright fringes can be seen on the screen. MY ATTEMPT: i worked out the angular separation between bright fringes to be 0.305 rad (i...
  41. S

    Diffraction Grating: Calculate Wavelengths

    Homework Statement light from an atomic hydrogen lamp falls on a diffraction grating with 200 lines per centimetre. on a screen 2.5 m away, the distance between green spots of the first and second order spectra is 2.43cm while the distance between a green spot and a red spot both of the first...
  42. E

    Single slit interference and Diffraction Grating

    Lets say I have a double slit interference experiment set up. Now if I cover one slit what CHANGES would be observed ? I know I would see fewer bright fringes and that the intensity of the bright fringes would fall. Is there anything else ?In a different scenario I have a diffraction grating...
  43. K

    How Wide Must a Diffraction Grating Be to Resolve Specific Emission Lines?

    How wide would the grating have to be for the two emission lines to be observably resolved? What is the m (order of diffraction peak) that is minimum to resolve these lines to be observed??R= Nm= wavelength/change in wavelength w= Nd i know that w=Nd w= (x) (2.5 * 10^-6 m) i...
  44. S

    Can someone confirm my calculations please (wavelength & grating seperation)

    Good evening everyone I was hoping someone could confirm my calculations are correct.I will put the question in normal font and my calculations in red bold: A laser of wavelength 500nm and grating separation of 100μm: a) find the angle of the first order of fringe spacing b) Distance of the...
  45. K

    Calculating Wavelength for Diffraction Grating Problem

    Homework Statement Light with a wavelength of 475 nm produces a first order maximum 0.214 m from the central bright line for a particular diffraction apparatus. At what distance would you expect a maximum using light of 625 nm? The Attempt at a Solution I am confused. For some reason...
  46. K

    Diffraction grating problem?

    Homework Statement Electrons are accelerated to an energy of 2.40 keV and then passed through a thin graphite film. The distance between the carbon atoms is 1.42 * 10^-10 m. Homework Equations b) Describe the diffraction pattern on a screen 5.00 cm from the graphite film. We're looking for...
  47. JJBladester

    Diffraction Grating interference pattern

    Homework Statement This is the interference pattern on a viewing screen behind two slits. (image of 7 bright fringes with black fringes between every pair of bright fringes) How would the pattern change if the two slits were replaced by 20 slits having the same spacing d between...
  48. S

    Relationship between Grating Spacing and Ring Radius?

    Homework Statement I'm doing a report on an electron diffraction experiment, where a carbon crystal is used as a diffraction grating. There are two line spacings d1, and d2. Observed in the experiment in two cocentric rings. What I'm unsure about is which spacing correlates to which spacing...
  49. A

    Calculate Angles for Diffraction Grating 1st & 2nd Order Maxima

    Homework Statement Light with wavelengths of 520 nm and 630nm passes through a diffraction grating that contains 6000 lines/cm. 1) Calcualte the angles for the first and second order maxima that would appear on the screen Homework Equations sin(Theta)m = m(Lamda)/d The Attempt at a...
  50. K

    Light from Element X through a diffraction Grating

    Homework Statement Light emitted by Element X passes through a diffraction grating having 1200 lines/mm. The diffraction pattern is observed on a screen 75.0 cm behind the grating. Bright fringes are seen on the screen at distances of 56.2 cm, 65.9 cm, and 93.5 cm from the central maximum. No...
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