Assertion: ultraviolet's wavelength | /r/HasProperty | visible
Facets:
value: very slightly
type: DEGREE
value: to humans
type: TRANSITIVE-OBJECT
value: usually
type: DEGREE
value: to the human eye
type: TRANSITIVE-OBJECT
Source sentences:
text: Light, or visible light, is a very narrow range of electromagnetic radiation of a wavelength that is visible to the human eye, or 380–750 nm which equates to a frequency range of 790 to 400 THz respectively.
text: Even within the range of wavelengths that are visible to humans, passerine birds can detect colour differences that humans do not register.
text: Wavelengths from about 345 to 400 nm are used for "Blacklight" effects (causing many fluorescent objects to glow) and are usually very slightly visible if isolated from more visible wavelengths.