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A = ɛDC, where ɛ is _______

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A = ɛDC, where ɛ is _______

(a) Incident light Intensity

(b) Transmitted light Intensity

(c) Extinction coefficient

(d) Concentration
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The correct choice is (c) Extinction coefficient

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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