zemax can help to design many kinds of optical systems. Here are the basic steps: $ \yZ;Z:
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1. make spec for your system e9LP!"@EY
2. make initial design P{bRRn4Z
3. choose glass materials ^"\3dfzKM
4. analysize the abration and image... v>XAzA
5. modify and optimze them (this is the core of the design). H%nA"-
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To do these, you need to study basic knowledge of geometric optics.