Double slit experiment (geometric maths problem)

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Thread starter Generic Turtle
Start date Sep 28, 2015
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Generic Turtle

Thread starter
Sep 28, 2015

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

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mfb

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Insights Author

Sep 28, 2015

PA = PD to a very good approximation as AD is extremely small compared to both.

Generic Turtle

Sep 28, 2015

Thank you

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Double slit experiment (geometric maths problem)

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