This paper presents a new method of drawing perspective shade and shadow in parallel rays, which makes use of plane trace and geometrical drawing method.
探讨了一种利用平面迹线和几何作图法，作无灭光线下透视阴影的新方法。
The method comprises the following steps: after parallel rays project to a target surface area element, acquiring a path parameter of each ray from incidence to reflection;
所述方法包括：当平行射线投向目标面元后，获取每条射线从入 射到反射的路径参数；
Then using another convex lens and a micrometer eyepiece the altered parallel rays is focused, and the imaging size of line pair of collimator imaged on the another convex lens is measured.
用一辅助凸透镜与一测微目镜进行平行光束的会聚，测出准直管玻罗板线对在辅助凸透镜焦平面上所成像的大小；
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
摘要分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象—笛卡尔线现象。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象？笛卡尔线现象。
Standing wave is parasitic effect of exposure, generated by multi reflection and interference of rays vertically incident upon parallel medium layers.
驻波是曝光中的寄生效应，是光线垂直入射到不同的平行平面介质层之间，经多次反射并干涉形成的。
The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。
Two kinds of convex lens which make parallel light rays converge to the focal point are given.
本文给出两种能使平行光严格聚焦于一点的凸透镜。
This article introduces a vehicles classification system which is a plane measuring system with parallel infrared rays in equal distance from one another and a classification subsystem.
本文介绍了一个车辆分类系统，它是由平行红外线族构成的平面检测子系统和分类子系统组成。
The axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions.
来自光源（1）的光线的轴线以及反向 散射到光检测器（3）的光线的轴线具有彼此紧邻并基本平行或重合的 部分。
The axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions.
来自光源（1）的光线的轴线以及反向 散射到光检测器（3）的光线的轴线具有彼此紧邻并基本平行或重合的 部分。
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