Yes. The longest visible wavelength / lowest visible frequency is the last color you see on the red end of the 'rainbow'. The shortest visible wavelength / highest visible frequency is the last color you see on the violet end of the 'rainbow'. These limits are not exactly the same for every human eye.
In the visible spectrum the shortest wavelength associated with a color is the WL of violet. ============================= Are there any wavelengths in the visible spectrum that are NOT associated with a color ?? The color of light that has the shortest wavelength is the last color you can see at the violet end of the spectrum. It's not exactly precisely the same one for everybody's eyes.
The visible violet light has a wavelength of about 400 nm. The visible indigo light has a wavelength of about 445 nm. The visible blue light has a wavelength of about 475 nm. The visible green light has a wavelength of about 510 nm. The visible yellow light has a wavelength of about 570 nm. The visible orange light has a wavelength of about 590 nm. The visible red light has a wavelength of about…
All of them. "Color" (or 'colour') is what your brain registers when a visible wavelength enters your eye and stimulates the retina enough for the brain to notice it. If there's a color, then that's a visible wavelength. If it's not 'visible', then your brain doesn't know about it, and there's no 'color'.