Does the frequency or the wavelength of the light matters in vision in human eye?
Light is an electromagnetic(EM) wave.What our eyes perceive is a part of the electromagnetic spectrum(or range of frequencies).This range is called the visible range with red at the lower end and violet at the upper end of this range. We cannot perceive EM waves of frequencies outside this range ie we cannot “see” ultraviolet rays or infrared rays or radio waves for that matter.
