A = ɛDC, where ɛ is _______

a-edc-where-e-is

A = ɛDC, where ɛ is _______
A. Incident light Intensity
B. Transmitted light Intensity
C. Extinction coefficient
D. Concentration
The correct choice is C. Extinction coefficient

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.