a compound lens system that forms an image free from chromatic aberration
achromatic lens的用法和樣例:
例句
The exact date of the first achromatic doublet's creation is not known, nor is the name of the person who first accomplished the task. 第一片消色差透鏡確實的發明日期並不清楚,也不清楚第一位發明人是誰。