Question

Which of the following options are correct in terms of wavelength for the different types of IR spectrometer?

(a) Near IR: 0.8 – 2.5 mm

(b) Mid IR: 0.8 – 2.5 mm

(c) Far IR: 2.5 – 50 mm

(d) Mid IR: 50 – 100 mm

The question was asked in final exam.

My query is from Instrumentation of IR topic in section Colorimetry and Spectrometry of Analytical Instrumentation

Answer 1

Right option is (a) Near IR: 0.8 – 2.5 mm

To explain I would say: Wavelength of near IR is 0.8 – 2.5 mm and for mid IR it is 2.5 – 50 mm. The wavelength of far IR is 50 – 1000 mm.