Assertion: spectrophotometer | /r/HasProperty | light source
Facets:
value: for sample illumination
type: PURPOSE
value: for selecting the desired wavelength
type: PURPOSE
Source sentences:
text: Each spectrophotometer includes a light source, a collimator, which is a lens or focusing device that transmits an intense straight beam of light, a monochromator to separate the beam of light into its component wavelengths, and a wavelength selector, or slit, for selecting the desired wavelength.
text: A spectrophotometer contains a spectrometer but also incorporates a light source for sample illumination.