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Calculating number of fringes

  1. Nov 3, 2013 #1
    Question are in paint doc. My answer is in red... I believe the answer is 4 and not 5. Please someone let me know if I'm correct.
     

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  3. Nov 4, 2013 #2

    mfb

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    Staff: Mentor

    The single-slit minimum cannot be at the 5th fringe on one side, as this has to be bright. The minimum has to be between 5 and 6, so the second minimum is somewhere between 10 and 12 (not inclusive). This gives 5 or 6 as possible answers.
     
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