The range of IR region is - (a) 50 Mm to 100Mm (b) 5MM - 150 mm (c) 2 Mm to 15 Mm (d) None of these
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(d) none of these
Explanation:
Infrared radiation (IR), also known as thermal radiation, is that band in the electromagnetic radiation spectrum with wavelengths above red visible light between 780 nm and 1 mm.
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