Discussion
What does an order-sorting filter do?
Answer: A
It passes the wanted order and blocks the shorter wavelengths that would arrive in a higher order at the same angle. Stray light, source switching and attenuation are other functions. Without it a reading in the visible could be contaminated by ultraviolet light the grating has folded onto the same path, and the error would look like a departure from Beer's law rather than an instrumental artefact.
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