optical filter
A device which reduces the spectral range (bandpass, cut-off, and
interference filter
) or radiant
power
of incident radiation (neutral density or
attenuance filter
) upon
transmission
of radiation.
Source:
PAC, 1996,
68
, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2257