Visible-spectrum
noun, Physics.
1.
the range of wavelengths of electromagnetic radiation that is normally visible, from 380 to 760 nm.
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.
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