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Why is the Fabry-Perot Interferometer on Na-lamp more accurate than Michelson Interferometer also on Na-lamp by counting the fringes of a circular pattern?

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  • $\begingroup$ What are your ideas as to the answer to this question? $\endgroup$ – Farcher Jan 18 '17 at 23:27
  • $\begingroup$ Have you ever seen the fringes of these instruments? $\endgroup$ – Pieter Jan 19 '17 at 0:10
  • $\begingroup$ What effect do multiple reflections have on the fringe width? $\endgroup$ – Farcher Jan 19 '17 at 7:57

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