Sander wrote:
> What happens after the reflection that makes the energy seem to break up
> in small parts the size of the grid squares?
> 

It stems from interference, and the match with the grid might be
caused by that the speed of the wave happens to be an integer. (The
grid lines have integer spacing; 2.)

Also remember that the wave equation is slightly different from the
usual "surface" or "water" equation, so the behaviour is not the same.

Simen.

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