Abstract
Publisher Summary This chapter discusses macrotheories and microtheories. There are numerous examples of theories of these two types. In geometrical optics light travels in straight lines, that it is reflected by a surface between two media in such a way that the angle of incidence is equal to the angle of reflection, and that it is refracted in accordance with Snell's law. Many facts about images can be explained using these assumptions of geometrical optics without invoking a theory regarding the physical composition of light, for example, without answering the question of whether light is composed of particles or whether it consists of a wave motion in some sort of matter. The chapter discusses physical requirement for microtheories and macrotheories.
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