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What is the range of visible light of electromagnetic spectrum?

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What is the range of visible light of electromagnetic spectrum?

(a) 380 to 780 mm

(b) 780 to 1080 nm

(c) 380 to 780 nm

(d) 380 to 1080 nm

I got this question in an internship interview.

Query is from Monitoring Labour Activity topic in portion Foetal Monitoring Instruments of Biomedical Instrumentation

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Correct option is (c) 380 to 780 nm

Explanation: The region in the electromagnetic spectrum which is normally used in spectroscopic work is very limited. Visible light represents only a very small portion of the electromagnetic spectrum and generally covers a range from 380 to 780 nm. The ultraviolet region extends from 185 mm to the visible.

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