Discussion
According to Beer's law, the intensity of transmitted light is decreased in proportion of :
Answer: B
By Beer's law, transmitted intensity falls in proportion to Concentration.
The combined Beer-Lambert law says absorbance is proportional to both the path length and the concentration of the absorbing species:
\[ A = \log \frac{I_{0}}{I} = \varepsilon\, l\, c \]
Historically, Lambert's law deals with the path length (distance through the sample) and Beer's law with the concentration. That is the basis of colorimetric and spectrophotometric analysis of pollutants: absorbance is read and converted to concentration from a calibration curve.
Distance is Lambert's variable, so it is the trap here. Volume and time do not enter either law.
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