What is the characteristic wavelength range of polychromatic and broadband light?

Polychromatic and broadband light encompasses a wide range of wavelengths, which are typically measured in nanometers (nm) on the electromagnetic spectrum. The characteristic wavelength range of polychromatic light is from about 400 nm to 700 nm, which includes visible light. When considering broadband light, it often extends to cover additional wavelengths outside the visible spectrum, occasionally reaching up to about 1000 nm.

The range of 400-1000 nm effectively captures both the visible spectrum (from approximately 400 nm to 700 nm) and the near-infrared region (from about 700 nm to 1000 nm). This broad coverage is important in various applications such as imaging and phototherapy, where both visible and infrared light play significant roles. Therefore, this choice accurately reflects the characteristic range of wavelengths that define polychromatic and broadband light.