>> Ah, now that brings back memories of doing the PSSC Physics
>> course at secondary school. Large flat water tanks with motor and
>> eccentric weight to make waves in the water ...
>
>Blinds down, light bulbs, diffraction gratings ?

Yeah, all that, making a lens with a shape under water, interference
patterns with two motors at varying phases and speeds, all real "hands on"
illustrative experimentation. Thems were the days.

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