Beer-Lambert Law — FRCA Primary MCQ
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Correct answer: A — Light absorption versus concentration of a substance in solution
A = εcl where A = absorbance / ε = molar absorption coefficient / c = concentration / l = path length. This principle underlies pulse oximetry / co-oximetry / and spectrophotometric analysis.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment