Design of a Spherically Corrected Achromat
Since the chromatic aberration of a lens depends only on its power, whereas the spherical aberration varies with bending, it is obviously possible to select that bending of an achromat that will give us any desired spherical aberration (within limits). There are two possible approaches to this design. The first is the four-ray method, requiring no optical knowledge, and the second makes use of a thin-lens study based on primary aberration theory to guide us directly to the desired solution. The latter method is by far the most desirable since it also indicates how many possible solutions there are to any given problem.
7.1 THE FOUR-RAY METHOD
In this procedure we set up a likely first form, which ...
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