Discussion
Why is 4 reciprocal centimetres adequate resolution for most routine work?
Answer: C
Bands in condensed phases are tens of reciprocal centimetres wide, so resolving to four already describes their shape completely and finer settings only cost time and signal-to-noise. Detector speed, source output and wavelength accuracy are not the binding constraint. A resolution better than the thing being resolved buys nothing, which is the same principle that governs slit width in a dispersive instrument.
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