The wavelength of green light is not a single, fixed value, as green light encompasses a range of wavelengths. However, the typical wavelength of green light is around 550 nanometers (nm).

Here's why it's a range:

* Visible spectrum: The visible spectrum of light, what we perceive as colors, is a continuous range of wavelengths.

* Green light: Green light falls somewhere in the middle of this visible spectrum.

* Perception: Our eyes perceive a range of wavelengths as "green." The exact wavelengths that fall within this range can vary slightly from person to person.

So, while 550 nm is a good general value for green light, keep in mind that green light can have slightly different wavelengths.