Discussion
A colourant mixture obeying Beer's law would have
Answer: A
Correct answer: absorbance proportional to concentration at each wavelength
\[ A = \varepsilon c l. \] Beer’s law holds for transparent, non-scattering media, and it is what makes absorbances additive across the components of a mixture. Transmittance and reflectance are exponential in concentration rather than proportional, which is exactly why the transformation to absorbance is made first.
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