Discussion
Which of the undermentioned wavelength range in micrometer (µm) corresponds to near IR range ?
Answer: B
The near-infrared region is 0.80 to 2.50 micrometres.
The infrared part of the spectrum is conventionally divided into three regions:
- Near IR: about 0.78 (0.80) to 2.5 micrometres (12,800 to 4,000 cm-1).
- Mid IR: 2.5 to 50 micrometres (4,000 to 200 cm-1), the region of fundamental molecular vibrations used for identification.
- Far IR: 50 to 1,000 micrometres.
The range 0.25 to 0.80 micrometres is ultraviolet and visible light. Near-infrared photography and imaging are used in document examination to distinguish inks that look alike in visible light.
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