How did Young get coherent light if he didn have a laser?
Indeed, he did predate lasers, by quite a bit. But in fact, you don’t need a laser to get coherent light from two slits (although laser light is extremely coherent and nice for this kind of thing). An ordinary light source (note that the same source illuminates both slits) provides light wavefronts that are coherent to good approximation at closely spaced slits. Think of water waves impinging on a barrier: they are in phase at the barrier. Basically what Young did is to split a single wavefront into two coherent parts.
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