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What is used for the measurement of unabsorbed radiant energy in spectrophotometer?

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What is used for the measurement of unabsorbed radiant energy in spectrophotometer?

(a) Optical system

(b) Radiating source

(c) Filtering Arrangement

(d) Detecting system

I have been asked this question in unit test.

This intriguing question comes from Pneumotachometers topic in chapter Pulmonary Function Analysers of Biomedical Instrumentation

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Correct answer is (d) Detecting system

Easiest explanation: An optical system for producing a parallel beam of filtered light for passage through an absorption cell (cuvette). The system may include lenses, mirrors, slits, diaphragm, etc. A detecting system for the measurement of unabsorbed radiant energy, which could be the human eye, a barrier-layer cell, phototube or photo-multiplier tube.

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