(光电信息工程专业英语)专业英语第四讲 几何光学.ppt

光电信息工程专业英语 Chapter 2 Geometrical Optics 1.3 Total internal reflection TIRFM:　Total Internal Reflection Fluorescence Microscopy 1.4 Fiber Optics 1. If we direct light into one end of a long rod of glass or plastic, the light is totally internally reflected by the walls, bouncing back and forth until it emerges at the far end. 翻译： 如果我们引导光进入长的玻璃棒或塑料棒的一端，光会被长棒的内壁来回全反射，直到它在另一端出现。 及物动词 vt. 1. 指挥;主持;管理She personally directs the operations of the company. 2. 命令;指示 His boss directed him to cancel the meeting. 3. 给...指路;指点Would you please direct me to the zoo? 形容词 a. 1. 径直的,笔直的2. 直接的 1.4 Fiber Optics 2. Because their fibers are so flexible, fiber optics light guides and coherent bundles are used in instruments designed to permit direct visual observation of otherwise inaccessible objects. Prime examples are endoscopes, which are used by physicians examine the interior of a patient’s body. 句子结构： Because…, … are used in instruments… 定语从句： Instrumnents designed to permit direct visual observation of otherwise inaccesible objects. 翻译： 由于光纤的柔韧性好，光纤光导和相干光纤束被用在某些仪器设备，（这些设备）被设计用于对其它不可接触目标的直接可视化观察。 1.4 Fiber Optics 3.The fibers are less expensive to produce than are copper wires, and they are resistant to noise caused by stray electromagnetic signals. 翻译： 光纤比铜线便宜，而且它们对杂散电磁信号所产生的噪声有抵抗力。 1.5 Thin lenses Lens 名词　n. 透镜;镜片 (照相机等的)镜头 (眼球的)晶体 及物动词 vt. 给...摄影(尤指摄制影片) 解释： lens man… lensless 1.5 Thin lenses Hold 及物动词 vt. 握着;抓住;夹住托住;支承占据,守住;吸住(注意力等)拥有,握有,持有容纳;包含认为;持有(观点) 举行 不及物动词 vi. 1. 持续,保持2. 顶住,支持3. 有效,适用 名词 n. 1. 抓住,握住;握法2. 可手攀(或脚踏)的东西,支撑点3. 掌握;支配(力) 　 4. 延迟;延期;耽搁 解释： Holder holding company 1.5 Thin lenses 4. Lenses that are thicker in the center than at their edges, such as those in figure. These are called positive or converging lenses, because they refract incident parallel rays so that they converge on a focal point located on the opposite side of the lens. 1.5 Thin lenses 5. Now, look at lenses that are thinner in the center than at their edges, such