The wavelength range of visible light radiation falls within the electromagnetic spectrum, which spans a wide range of wavelengths. Visible light is just a small portion of this spectrum. The approximate wavelength range of visible light is between 400 to 700 nanometers (nm).
To provide some context, the colors of the rainbow correspond to different wavelengths within this range. Violet light has the shortest wavelength, around 400 nm, while red light has the longest wavelength, around 700 nm. In between, we have various colors such as blue, green, yellow, and orange, each with its own specific wavelength.
It's worth noting that the boundaries between visible light and adjacent regions of the electromagnetic spectrum, such as ultraviolet (UV) and infrared (IR), are not sharply defined. The transition between visible light and other regions is gradual, with wavelengths becoming either shorter (towards UV) or longer (towards IR).