the lens that is farthest from the eye in an optical device with more than one lens
双语例句
用作名词 (n.)
Objectives which consist only of one lens can be used for visual and photographic observations. 由单透镜组成的物镜可作目视和照相观测用。
Which shows that the hybrid refractive-diffractive lens can effectively eliminate the aberrance of a telephoto lens with lower weight and simple structure. 结果表明，利用折衍混合能有效地校正长焦物镜的像差，极大地降低系统的重量和复杂程度，不失为长焦物镜设计的一条有效途径。
