Bandpass filters transmit light only within a definedspectral band ranging from less than one to many nanometerswide.

In details: Bandpass filters transmit light only within adefined spectral band ranging from less than one to many nanometerswide. They are used in a wide variety of applications wherespectral isolation is required. Bandpass filters are preferable tomonochromators because of their higher transmission and bettersignal-to-noise.