专业英语第讲教案.ppt

English in Optoelectronic Information Technology Chapter 1 Geometrical Optics * * 1.1 Models of Light: Rays and Waves New Words Expressions: geometrical optics n. 几何光学 photosynthesis n. 光合作用 ultraviolet a.紫外线的 infrared a.n. 红外线的，红外线 perpendicular a.n.垂直的，垂直 angle of incidence n. 入射角 specular reflection n.镜面反射 diffuse reflection n. 漫反射 rearview n. 后视镜 paraxial approximation n.旁轴近似 index of refraction n. 折射系数 critical angle n. 临界角 prism n. 棱镜，棱柱 fiber optics n. 光纤 coherent bundle n.相干光束 light guide n. 光导，光学纤维 periscope n. 潜望镜 image conduit n. 传像管 converging lens n.会聚透镜 diverging lens n. 发散透镜 unaided eye n.肉眼 thin lens n. 薄透镜 focal length n.焦距 optical axis n.光轴 convex a. 凸的，凸面的 concave a.凹的，凹面的 object distance n. 物距 image distance n. 像距 1.1 Models of Light: Rays and Waves Although we usually consider light to be a wave phenomenon, that is not the only possible view. The idea that light is composed of a stream of particles is also consistent with the observation that a beam of light from a flashlight or a laser seems to travel in straight lines except when it encounters an interface between two optical media. We call this straight-line path a ray of light. The ray model allows us to explain in simplest terms the formation of images by lenses and mirrors. 虽然我们通常认为光是一种波动现象，但是这并不是可能存在的唯一观点。除非遇到障碍物，一束由手电筒发出的光或者一束激光将沿直线传播，光是由粒子束组成的观点与此相一致。我们把这种（光的）直线路径称为光线。光线的模型使得我们可以用最简单的术语来解释透镜和平面镜形成的像。 3 1.1 Models of Light: Rays and Waves However, light displays particle like characteristics when it interacts with matter, as it does, for example, when sunlight falls on a leaf and photosynthesis take place. The apparent conflict over this waveparticle duality can not be understood with just the theories of Newto