interference test

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image/svg+xml \
Options: Source 1 - blue Source 2 - red
Select the number of waves to show:
Show troughs in the diagram above:
Draw line between source and point:

Other options:
Allow adding of points
Clear all lines and points:
Remove the last point and dot:
Animate
Point number Number of wavelengths from source 1 Number of wavelengths from source 2 Path difference Constructive / destructive show wave

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I think you could work out the answer yourself from here.....