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What principle does pulse oximetry follow?

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in Clinical Science by (102k points)
What principle does pulse oximetry follow?

(a) Law of Absorbance

(b) Law of Reflection

(c) Beer – Lambert Law

(d) Law of Irradiance

I got this question in final exam.

The question is from Measuring Blood Pressure & Pulse Oximetry topic in division Diagnostic Investigation in Neurology and Cardiology of Clinical Science

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Right choice is (c) Beer – Lambert Law

To explain: Beer-Lambert relates the emerging light with the concentration of the solution and the thickness of vial/object containing the solution. When light is incident on the solution, some of the light is absorbed. This absorption depends on the concentration of the solution and the distance the light travels before it emerges. This light is measured on the outgoing end and it gives a measure of how much oxygen exists in the blood.

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