In order to distinguish between wavelengths independent of light intensity, one must have at least ______visual pigment(s).
A) one
B) two
C) three
D) no visual pigments are required.

Question

Quizplus · Accepted Answer

The ability to distinguish between different wavelengths of light is due to the presence of visual pigments in the retina of the eye. These pigments are sensitive to specific wavelengths of light, and the brain interprets the signals received by these pigments to create the perception of color. While one type of pigment can detect different wavelengths of light, it is not sufficient to distinguish between them. Two types of pigments are necessary, as they allow the eye to compare the signals received by each and determine the wavelength of the light being detected. Therefore, the minimum number of visual pigments required to distinguish between wavelengths independent of light intensity is two.

In Order to Distinguish Between Wavelengths Independent of Light Intensity