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A = log I0/I,where I0 is_____

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A = log I0/I,where I0 is_____

(a) Incident light Intensity

(b) Transmitted light Intensity

(c) Extinction coefficient

(d) Concentration

The question was asked during an interview.

My question comes from Pulse Oximeter topic in division Oximeters of Biomedical Instrumentation

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Right choice is (a) Incident light Intensity

The best explanation: A pulse oximeter shows the percentage of arterial hemoglobin in the oxyhemoglobin (HbO2) and hemoglobin (Hb). This observation A = -logT = log I0/I = ɛDC where Io and I are incident and transmitted light intensities, e is the extinction coefficient, D is the depth of the absorbing layer and C is concentration.

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