The Array Theorem

The extension of a single aperture problem to an N-slit aperture problem is a common way to drive home the point about how diffraction works, and is actually very useful. An N-slit aperture problem would be applicable in the case of a grating, or a periodic pattern of apertures of other shapes.

We can see in the image below that the effect of a much smaller x-dimension in comparison to y yield a pattern that primarily spreads in the x-direction.

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