How Do You Calculate Path-Length Differences in Two-Source Interference?

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The discussion focuses on calculating path-length differences at specific points (A, C, and D) in a two-source interference problem. Users initially attempted various numerical answers in terms of wavelength (λ) but found them incorrect. Eventually, one participant successfully derived the correct values by analyzing the provided diagrams. The importance of visual representation in solving such problems is emphasized, as it aids in understanding the path-length differences. The conversation highlights the iterative process of problem-solving in physics.
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Homework Statement



1014010E.jpg

http://session.masteringphysics.com/problemAsset/1014010/14/1014010E.jpg

What are the path-length differences at Points A, C, and D
(respectively, ΔdA, ΔdC, ΔdD)?

Enter your answers numerically in terms of lambda λ

Homework Equations



Does this require an equation? I figured it was pictorial

1014010D.jpg

http://session.masteringphysics.com/problemAsset/1014010/14/1014010D.jpg

The Attempt at a Solution



I looked at the picture and tried the following, which were all incorrect:

3.5, 2.5, 2
3, 2, 1.5
 
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