Discussion
How is a too-concentrated sample brought into that range?
Answer: C
Both dilution and a shorter path reduce the absorbance in proportion, bringing the reading into the range where photometric error is least. Slit width and lamp current affect the light available rather than the absorbance, and moving off the peak works but sacrifices the flat region that makes the reading insensitive to wavelength error. Two of the Beer-Lambert law's three terms are under the operator's control, and that is where the remedy lies. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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