What are the roles of the primary and secondary filters in a fluorometer?

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In a fluorometer, you must both deliver a clean excitation to the sample and detect only the light that comes from the excited fluorophore. The primary filter, the excitation filter, passes a narrow band of wavelengths that effectively excites the sample while blocking other wavelengths. After the sample emits fluorescence, the secondary filter, the emission filter, passes only the emission wavelengths of interest to the detector and blocks excitation light and other stray light, reducing background radiation. This separation of excitation and emission light is what makes the signal detectable and accurate. The other options mix up the roles—filters don’t measure or calibrate signals, and they don’t function to align optics or analyze light—so the described pairing of excitation by the primary filter and background reduction by the secondary filter best matches how fluorometers operate.