Discussion
What does transmittance measure?
Answer: A
Transmittance is the ratio of transmitted to incident intensity, a number between zero and one or expressed as a percentage. The fraction absorbed is one minus it for a non-scattering sample, the logarithm of the ratio is absorbance, and photon energy is set by the wavelength. Because a detector measures intensity directly, transmittance is what an instrument actually observes and absorbance is computed from it. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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