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Double slit experiment (geometric maths problem)

  1. Sep 28, 2015 #1
    I understand the experiment and the trigonometry involved except for one statement.

    Why is BP-AP=BD in this diagram

    http://www.citycollegiate.com/interference2.htm

    How do you know this/ work it out.

    Many thanks
     
  2. jcsd
  3. Sep 28, 2015 #2

    mfb

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    Staff: Mentor

    PA = PD to a very good approximation as AD is extremely small compared to both.
     
  4. Sep 28, 2015 #3
    Thank you
     
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