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An optical component that allows certain wavelengths or frequencies of light to pass through while reflecting or absorbing all others. Types of filters include bandpass, longpass, shortpass, interference notch and rugate notch, color, dichroic, and neutral density.

See also Cold Mirror , Cavity , Central Wavelength (CWL) , Stopband , Longpass Filter , Neutral Density Filter (ND) , Rugate Notch Filter , Heat Absorbing Glass , Notch Filter , Peak Transmittance , Shortpass Filter , Full Width at Half Maximum (FWHM) , Bandwidth , Fluorescent Filter , Hot Mirror , Dichroic Filter , Cut-Off Wavelength , WRATTEN Filter , Cut-On Wavelength , Interference Filter , Dichroic Coating

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