N-source versus N-slit interference

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The discussion centers on the differences in intensity patterns produced by N-slit interference versus N-point sources in the Fraunhofer regime. It highlights that the intensity pattern from multiple slits decays with distance from the center of the screen, while the pattern from point sources exhibits periodic variation without average decay. The user seeks a physical justification for this phenomenon despite being able to derive the electric field and intensity mathematically. Understanding the underlying principles of wave interference and diffraction may provide clarity on these contrasting behaviors. The inquiry emphasizes the need for deeper insight into the physical implications of these interference patterns.
jdstokes
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Hi all,

I don't understand why the intensity pattern for an arbitrary number of slits will decay with distance from the centre of the screen, whereas the intensity pattern due to N-point sources will vary periodically with no average decay. I can derive the electric field and intensity for both cases to show it is true, but I can't justify it physically. Any hints would be appreciated.

Thanks

James
 
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I should also have mentioned that I'm working in the Fraunhofer regime.
 

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