本实验针对透射式望远镜的消色差物镜光学系统研究.通过平行光法测定凸透镜的焦距，通过厚透镜公式确定凸透镜的折射率.通过凹透镜和凸透镜所组成的复合透镜焦距测量，反演出凹透镜的焦距，进而完成凹透镜折射率测定.通过消色差公式，推演出透镜材料的材料及阿贝系数，验证消色差复合透镜的设计原理.

This study focuses on the optical system of achromatic objectives for refracting telescopes. The focal length of a convex lens is measured using the parallel light method, and its refractive index is determined via the thick lens formula. By measuring the focal length of a compound lens composed of convex and concave lenses, the focal length of the concave lens is deduced, enabling the determination of its refractive index. Based on the achromatic condition formula, the lens materials and Abbe numbers are derived, validating the design principles of achromatic compound lenses.