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## Main Question or Discussion Point

Can someone explain how the laser pointer is generating the rectangular patterns shown in this youtube video?

I assume that there are just two diffraction gratings that are rotated relative to each other, but could someone explain mathematically how to predict what pattern is formed for different rotation angles?

Thanks,

Hunter

I assume that there are just two diffraction gratings that are rotated relative to each other, but could someone explain mathematically how to predict what pattern is formed for different rotation angles?

Thanks,

Hunter