zemax can help to design many kinds of optical systems. Here are the basic steps: XzT78
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1. make spec for your system 99^AT*ByY
2. make initial design [ULwzjss#L
3. choose glass materials /Q?~Q0{)es
4. analysize the abration and image... S:ls[9G[3
5. modify and optimze them (this is the core of the design). 0VzXDb>`
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To do these, you need to study basic knowledge of geometric optics.