Author: admin
放大镜(英文名称:magnifier):放大镜用来观察物体细节的简单目视光学器件,是焦距比眼的明视距离小得多的会聚透镜。物体在人眼视网膜上所成像的大小正比于物对眼所张的角(视角)。放大镜视角愈大,像也愈大,愈能分辨物的细节。移近物体可增大视角,但受到眼睛调焦能力的限制。使用放大镜,令其紧靠眼睛,并把物放在它的焦点以内,成一正立虚像。放大镜的作用是放大视角。
This entry was posted on 星期二, 六月 10th, 2008 at 上午 6:07 and is filed under 里氏硬度计. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.
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