On page 160, it says "Humans can perceive color from deep reds at lower wavelengths to violet at higher wavelengths".
It should read "... deep reds at longer wavelengths to violet at shorter wavelengths". Red has a lower frequency than violet, which means that the the wavelength for red is actually longer (red has a wavelength of ~650 nm, and violet has a wavelength of ~400 nm). Alternately, it could read "... deep reds at lower frequencies to violet at higher frequencies".
For anyone interested, these numbers came from the following NASA website: eosweb.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html
It should read "... deep reds at longer wavelengths to violet at shorter wavelengths". Red has a lower frequency than violet, which means that the the wavelength for red is actually longer (red has a wavelength of ~650 nm, and violet has a wavelength of ~400 nm). Alternately, it could read "... deep reds at lower frequencies to violet at higher frequencies".
For anyone interested, these numbers came from the following NASA website: eosweb.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html