AP BIOLOGY

Detailed explanation-1: -The human eye sees color over wavelengths ranging roughly from 400 nanometers (violet) to 700 nanometers (red). Light from 400–700 nanometers (nm) is called visible light, or the visible spectrum because humans can see it.

Detailed explanation-2: -Visible light has a wavelength range from  400 nm to  700 nm.

Detailed explanation-3: -Visible light is usually defined as having wavelengths in the range of 400–700 nanometers (nm) or one billionth of a meter. EM waves are categorized according to their wavelengths and frequencies (number of waves passing a point in a certain time).