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光阑guānglán
(1) 限制透镜或光学系统装置光孔的(如带孔的板);光阑光(好工具.)圈快门
英diaphragm;aperture光学仪器中能对光束起限制作用的长方形或圆形通光孔。一般用来控制光强度、减少像差及增加聚焦的深度。依其作用可分为孔径光阑和视场光阑二种。孔径光阑限制入射光束大小；视场光阑则是控制成像景物面积的大小。光阑越小，像差越小，景深越大，像越清晰，但是明亮度则减弱。
光guāng(1)（名）通常指照耀在物体上、使人能看见物体的那种物质；如太阳光、灯光、月光等。可见光是波长7。7×10…5厘米到4×10…5厘米的电磁波。此外还包括看不见的红外光和紫外光。光在真空中的传播速度每秒约三十万公里。因为光是电磁波的一种；所以也叫光波；在一般情况下光沿直线传播；所以也叫光线。参看〔红外线〕、〔紫外线〕。(2)（名）景物：风～｜春～明媚。(3)（名）光彩；荣誉：为国增～。(4)敬辞；表示光荣；用于对方来临：～临｜～顾。(5)（动）光大：～前裕后。(6)（形）明亮：～明｜～泽。(7)（形）光滑；光溜：磨～｜这种纸很～。(8)（副）一点不剩；全没有了；完了：精～｜用～｜把敌人消灭～。(9)（动）（身体）露着：～膀子｜～着头。(10)（副）只；单：任务这么重；～靠你们两个人恐怕不行。(11)（Guānɡ）姓。
阑读音：lán阑lán(1)同“栏”。(2)同“拦”。阑lán（动）〈书〉将尽：岁～｜夜～人静。