Discussion
What does the slit width of a monochromator control?
Answer: A
The slit width sets how wide a band of wavelengths reaches the sample, so a narrow slit gives better resolution and a wide one gives more light. It does not change the source, the path length or the centre wavelength. That resolution and signal-to-noise pull in opposite directions through one adjustment is the central compromise of the instrument, and the right setting depends on how sharp the absorption band being measured actually is. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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