Discussion
What is the Jacquinot or throughput advantage?
Answer: C
An interferometer needs no narrow entrance slit, so a large circular aperture can be used and far more energy reaches the detector. Simultaneous measurement is the Fellgett advantage and laser calibration is the Connes advantage in wavelength accuracy. Three distinct benefits, each with its own name and its own mechanism, and together they account for the technique's complete displacement of dispersive instruments. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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