zemax can help to design many kinds of optical systems. Here are the basic steps: \,v^v]|
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1. make spec for your system 6l|L/Z_6
2. make initial design 4][VK/v+
3. choose glass materials S|d /?}C|e
4. analysize the abration and image... A?tCa*b^
5. modify and optimze them (this is the core of the design). !yg &zzP*
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To do these, you need to study basic knowledge of geometric optics.