Does it have anything to do with the fact that fabry Perot interferometer uses multiple beams while michelson only uses 2 beams

  • $\begingroup$ Yes, it's because the Fabry-Perot involves the interference of many reflected beams of light. In the same vein, the x-ray diffraction rings from the powder diffraction of a sample with very small crystallites will be broader than the diffraction rings from a sample with larger crystallites. $\endgroup$ – Samuel Weir May 21 '17 at 14:12
  • $\begingroup$ Why are multiple beam fringes sharper? $\endgroup$ – Derby Moose May 21 '17 at 15:07
  • $\begingroup$ You can also observe the mutiple paths make sharper fringes in the comparison between a diffraction grating and a two-slit mask with the same spacing: fringes in the same places, but the grating makes a very sharp pattern. $\endgroup$ – dmckee May 21 '17 at 17:16
  • $\begingroup$ Yes, but what's the rigorous reasoning behind it being sharper? $\endgroup$ – Derby Moose May 21 '17 at 17:17
  • $\begingroup$ I'm not going to write an answer, because the last time I tried (for a student of mine) it stretched to more than four pages and still wasn't as clear on the page as in my head. I think it is best explained in the phasor framework, so if you are aware of that tool, you might want to mention it—it will give potential answer writers a jumping off point. $\endgroup$ – dmckee May 21 '17 at 17:48

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