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Chapter 36: Diffraction

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Fundamentals Of Physics
Pages: 1081 - 1115

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126 Questions for Chapter 36: Diffraction

  1. At night many people see rings (called entoptic halos) surrounding bright outdoor lamps in otherwise dark surroundings. The rings are the first of the side maxima in diffraction patterns produced by structures that are thought to be within the cornea (or possible the lens) of the observer’s eye. (The central maxima of such patterns overlap the lamp.) (a) Would a particular ring become smaller or larger if the lamp were switched from blue to red light? (b) If a lamp emits white light, is blue or red on the outside edge of the ring?

    Found on Page 1108
  2. Figure shows a red line and a green line of the same order in the pattern produced by a diffraction grating. If we increased the number of rulings in the grating – say, by removing tape that had covered the outer half of the rulings – would (a) the half-widhts of the lines and (b) the separation of the lines increase, decrease, or remain the same? (c) Would the lines shift to the right, shift to the left, or remain in place

    Found on Page 1108
  3. A diffraction grating has 200 rulings/mm, and it produces an intensity maximum at θ=30°.

    Found on Page 1115
  4. Show that the dispersion of a grating is D=tanθλ

    Found on Page 1115
  5. Monochromatic light (wavelength=450nm) is incident perpendicularly on a single slit (width=0.4mm). A screen is placed parallel to the slit plane, and on it the distance between the two minima on either side of the central maximum is 1.8mm.

    Found on Page 1115
  6. A beam of x rays with wavelengths ranging from0.120nm to 0.07nm scatters from a family of reflecting planes in a crystal. The plane separation is0.25nm. It is observed that scattered beams are produced for0.100nmandlocalid="1664277381313" 0.075nm. What is the angle between the incident and scattere

    Found on Page 1115
  7. Show that a grating made up of alternately transparent and opaque strips of equal width eliminates all the even orders of maxima (exceptm=0).

    Found on Page 1115
  8. Light of wavelength 500nm diffracts through a slit of width2μm and onto a screen that is 2maway. On the screen, what is the distance between the center of the diffraction pattern and the third diffraction minimum?

    Found on Page 1115
  9. If, in a two-slit interference pattern, there are8bright fringes within the first side peak of the diffraction envelope and diffraction minima coincide with two-slit interference maxima, then what is the ratio of slit separation to slit width?

    Found on Page 1115
  10. White light (consisting of wavelengths from 400nm to 700nm) is normally incident on a grating. Show that, no matter what the value of the grating spacing d , the second order and third order overlap.

    Found on Page 1115

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