Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Visible light is light that has wavelengths that can be detected by the human eye. The wavelength of visible light determines the color that the light appears. As you can see in the Figure below , light with the longest wavelength appears red, and light with the shortest wavelength appears violet. In between are all the other colors of light that we can see. Only seven main colors of light are actually represented in the diagram. Answer: wavelengths
A:
Visible light has what that can be detected by the human eye?