本篇論文研究如何挑選出良好的雙片玻璃組合以校正縱向色差、球面像差及彗星像差之設計。利用Matlab程式編寫二次色散公式排序縱向色差很小的雙片玻璃組合，而在此玻璃組合中找出雙片鏡片V-number差值越大，折光率越小之鏡組，可有效降低球面像差與彗星像差，得出雙片鏡組最佳值設計。

The essay aims to design a program by using software Matlab helping pick up doublet design in good quality, which can improve axis chromatic aberration、thrid order spherical aberration and thrid order coma. With using the program, a secondary spectrum is wirtten to sort axis chromatic aberration from high to low of glass combinations, and to find the two glasses whose V-number vale is high. The higher the V-number difference value is, the lower the power is, which helps reduce thrid order spherical aberration, thrid order coma and means the doublet in greatest value.

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