Discussion
What limits the resolution of a Fourier transform instrument?
Answer: A
Resolution is inversely proportional to the maximum optical path difference, so a longer mirror travel resolves finer structure. The aperture affects throughput, averaging affects noise, and detector speed affects how fast the mirror may move. That resolution depends on a mechanical travel rather than an optical slit is the structural difference from a dispersive instrument and is why the two are specified in quite different terms. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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