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A=abc, a is molar absorptivity
b is distance
c is molarity
A is absorbance
It is best to limit A value within the range 0.5 - 1.0.
It is best to avoid measuring below A = 0.1
(small difference between large numbers)
It is best to avoid measuring above A = 2.0
(where only 1% of light is transmitted and stray light becomes important).
source
http://www.chem.uwa.edu.au/enrolled_students/MAST_sect2/sect2.3.2.html
last two paragraph
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