= Solution
In <division of amplitude>, one incident beam is split into two or more parts at a partially reflecting interface; they follow distinct paths and are recombined. The <Michelson interferometer> and <thin-film interference> use this principle. In <division of wavefront>, spatially distinct parts of the same <wavefront> are selected and allowed to overlap, as in <double-slit interference>. Both require adequate <optical coherence>; <wavefront> division particularly exposes the need for <spatial optical coherence> between the selected regions.
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