PPT Slide Slide 2 of 27 The physical properties of visual stimuli Radiant electromagnetic energy provides the necessary stimuli for the human visual system.
Radiant energy has two defining properties.
In addition, light can be defined as discrete particle or quanta of energy termed a photon. The psychological attribute correlated quantitatively with frequency is color or hue. The intensity of light refers to the amount of radiant energy and its psychological correlate is brightness.