What term describes the total range of wavelengths transmitted between two points?

• A. Bandpass
• B. Bandwidth
• C. Wavelength spread
• D. Optical window

Answer: (A)

Bandpass describes the range of wavelengths a filter or system allows to pass. It’s defined by two cutoff wavelengths, and everything between them is transmitted while wavelengths outside are blocked. So the total range transmitted between those two points is the bandpass. Bandwidth would be the width of that range (the difference between the cutoffs), not the range itself. The optical window refers to a broad range where a material is transparent, not the specific transmitted range of a device. Wavelength spread isn’t a standard term for this concept.