(光电信息工程专业英语)专业英语第七讲Geometrical Optics.ppt

光电信息工程专业英语 Chapter 2 Geometrical Optics 1.6 Locating Images by Ray Tracing 8 . An ordinary piece of flat glass, such as a window with parallel faces, passes light without changing its direction. Although the direction of the ray does not changes, the ray is displaced laterally. 翻译： 　 一个普通的平面玻璃，例如带有两个平行面的玻璃窗，透过光线而不改变它的方向。虽然方向不改变，但光线会发生侧移。 1.6 Locating Images by Ray Tracing The object may be self-luminous, giving off its own light(like the sun or a light bulb), or it may reflect the light that falls on it (like an apple or a page of this book). 9. In either case, an image of the object is formed where light rays that come from points on the object intersect or at the points from which the rays appear to originate. 翻译： 　　任何一种情况下，在来自物的光线相交的位置形成图像（实），或在看起来发出光线的点形成图像（虚）。 1.6 Locating Images by Ray Tracing 10 A virtual image is formed at a point where the light appears to converge, or from which it appears to come. 虚像在光线看起来会聚的点形成，或者是从这一点发出来的光形成。 虚像在两种位置形成：一种位置是光线看起来要会聚的点，另外一种位置是光线看起来是由这一点发出的 1.6 Locating Images by Ray Tracing 11. Let us state the graphical procedure to follow for locating the image from a given lens when you know the object’s position. In the next section, we will describe how to calculate the image height and location algebraically from this graphical ray diagram. You should refer to both parts of figure 1.14 as you read these steps. Graphical 图解的，绘画的 Algebraical 代数的 Principal axis　主轴 Lateral or linear magnification 横向或线性放大倍数。 1.7 The Thin-lens Equation 1. In the predceding derivation, we examined the special case of a converging lens with the object placed outside the focal point. However, the thin-lens equation holds for both converging and diverging thin lenses and for any object distance, provided the following sign conventions are maintained. 词汇： Preceding　在前的，前述的 Hold 有效 Sign convention 符号规则 Maintain 维持，供养，继续，主张 参考翻译： 在上述的推导中，我们检验了物在会聚透镜焦点以外的特殊情况。 然而，如果遵守下述的符号规则，薄透镜公式对于会聚和发散薄透镜都是有效的，且不论物体远近。 Provided, conj.　假如，倘若：Provided (that) there is no opposit