visible spectrum

noun Physics.

the range of wavelengths of electromagnetic radiation that is normally visible, from 380 to 760 nm.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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American Heritage

Medical Dictionary

visible spectrum vis·i·ble spectrum (vĭz'ə-bəl)
n.
The part of the electromagnetic spectrum visible to the human eye, extending from extreme red, 760.6 nanometers, to extreme violet, 393.4 nanometers.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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