Assertion: filter | /r/HasProperty | transparent
Facets:
value: normally
type: DEGREE
Source sentences:
text: Such filters are normally transparent, but when a leaky guided mode of the waveguide is excited they become highly reflective (a record of over 99% experimentally) for a particular polarization, angular orientations, and wavelength range.
text: Such filters appear black to the eye, but are transparent when viewed with an IR sensitive device.