Discussion
Why is a grating preferred to a prism in a modern monochromator?
Answer: C
A grating's angular dispersion is close to linear in wavelength, so the mechanical drive and the wavelength scale relate simply, whereas a prism's dispersion varies strongly across the range. A grating reflects rather than transmitting, still needs rotating, and produces stray light through its own imperfections and higher orders. A component chosen because it linearises a scale, rather than because it disperses more, is a recurring pattern in instrument design.
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