ABSTRACT
In this chapter, we consider geometric optics, which is an approximation to wave optics that can be used when considering an optical system composed of elements that are much larger than the wavelength of light going through the system. en, we can ignore the wave nature of light, aside from its color, and assume that it will travel in a straight line, which is oen called a ray. Although geometric optics is only an approximation to wave optics, it is technologically useful for the design and modeling of the adaptive optical systems that will be considered here. It greatly simplies the calculations to a point that allows intuition to guide the design. is is not usually the case when considering the Huygens integral!
