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[itex]\Large{\frac{sin(x)}{x}}[/itex]

I first saw it 1 year ago, when we studied limits. I don't know why, but I really like this function.

Can anybody tell me an example, in nature where we have behaviour that has sinc function characteristics.

Why am I asking this?

Fourier transform of aperiodic square wave is this function(give or take few constants).

And this function would be impulse response of lowpass filter.

So a natural process, that can be described with sinc function. Or approximated with it.