zemax can help to design many kinds of optical systems. Here are the basic steps: +L$Xv
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1. make spec for your system U4'#T%*
2. make initial design $t+,Tav
3. choose glass materials b1I]>\
4. analysize the abration and image... XPc^Tq
5. modify and optimze them (this is the core of the design).
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To do these, you need to study basic knowledge of geometric optics.