visible spectrum

noun Physics.
the range of wavelengths of electromagnetic radiation that is normally visible, from 380 to 760 nm. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

visible spectrum vis·i·ble spectrum (vĭz'ə-bəl)
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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Example sentences
While half of the sun's power lies in the visible spectrum, the other half lies
  in the infrared spectrum.
It would be better, of course, if chlorophyll could absorb light across the
  whole of the visible spectrum.
Multispectral imaging works by scanning objects at a series of specific
  frequencies both within and beyond the visible spectrum.
It radiates hot blue light in the visible spectrum and gives the cloud a bluish
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