ABSTRACT
Problems of light scattering and absorption in powder layers are easily handled by twoflux methods based on Kubelka-Munk’s theory or Johnson’s theory when the path of light can be reduced to one dimension. Calculations for powder screens with a complicated structure, however, or those for the resolution of simple and uniform screens require a method that explicitly uses tilted light rays. For example, it is difficult to use a two-flux method to find out how much emitted light is absorbed by each component in the phosphor screen of a color picture tube like that shown in Figure 12. A six-flux method1-4 or a many-flux method5 is expected to give better results in some cases, but such methods are still not adequate for these types of practical problems.
