Discussion
What limits the resolution of a Fourier transform instrument?
Answer: D
Resolution is inversely proportional to the maximum optical path difference, so a longer mirror travel resolves finer structure. There is no dispersing slit, a single detector is used, and the source sets the range rather than the resolution. That resolution depends on a mechanical travel rather than on an optical slit is the structural difference from a dispersive instrument, and it is why the two are specified in quite different terms.
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