Here's a breakdown:
* Visible light is the portion of the electromagnetic spectrum that humans can see.
* Wavelength determines the color of visible light.
* 0.4 micrometers corresponds to violet light, the shortest wavelength visible to humans.
* 0.7 micrometers corresponds to red light, the longest wavelength visible to humans.
Therefore, waves between 0.4 and 0.7 micrometers represent the range of colors we perceive as violet to red.
