Question

Which of the following component is used for selection of narrow band in spectrophotometer?

(a) Optical system

(b) Radiating source

(c) Filtering Arrangement

(d) Detecting system

I have been asked this question in an international level competition.

The origin of the question is Pneumotachometers topic in division Pulmonary Function Analysers of Biomedical Instrumentation

Answer 1

The correct answer is (c) Filtering Arrangement

The best I can explain: A source of radiant energy, which may he a tungsten lamp, a xenon-mercury arc, hydrogen or deuterium discharge lamp, etc. Filtering arrangement for the selection of a narrow band of radiant energy. It could be a single wavelength absorption filter, an interference filter, a prism or a diffraction grating.