Characterizing Light Sources Color Filters and Pigments
If we are to be able to understand the way the eye transmits nerve impulses, we need to be able to characterize accurately the light that is incident upon the eye. Obviously, the light generally casts an image with great variation in detail, with respect to both color and intensity. In this chapter, we will restrict ourselves to an image that consists of a field of uniform color and intensity. Such an image can be produced by having a light beam be cast upon and then reflected by a white screen. Therefore, we will focus our attention upon the characterization of a light beam.