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purple convex lens 紫色凸透镜
Just as a double convex lens enlarges, so a double concave lens reduces. 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
A convex lens is used to concentrate rays of light. 凸透镜用于聚集光线。
A convex lens is used to concentraterays of light. 凸透镜用于聚集光线。
Just as a double convex lens enlarges,so a double concave lens reduces. 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
The braiding yarns' section looks like a flat convex lens approximatively. 编织纱线的截面形状近似为扁平的凸透镜形；
Methods Hypermetropia and myopia were induced by playing concave and convex lens in front of eyes of 32 subjects. 方法在正常眼前放置正、负球镜,人工诱导单纯性远视、近视性屈光参差。
Conclusion Wearing lower degree convex lens can reduce incidence rate of myopia in primary school students. 结论配戴低度凸透镜可降低小学生近视的发生率。
Wearing lower degree convex lens can reduce incidence rate of myopia in primary school students. 配戴低度凸透镜可降低小学生近视的发生率。
A convex lens can be used to concentrate the sun's ray and thus burn a hole in a piece of paper. 凸透镜可以用来聚集太阳光,将一张纸片烧穿一个洞。
The surfaces of the concave lens may be proportioned so as to aberrate exactly equal to the convex lens. 凹透镜的表面可以进行均匀处理，以便使像差完全与凸透镜一致。
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。
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。
On MRI, the lesion appeared double convex lens or egg in shape in coronal section and round or arrow head like in shape in sagittal section. mri冠状位像呈“双凸透镜”形、卵圆形 ,矢状位像呈卵圆形、“箭头样”表现 ;
Style apically 5-fissured.Capsule (immature) obconical, 4-5 mm, glabrous, apex slightly projected and resembling a convex lens. 蒴果(未发育完全)倒锥状，4-5毫米，无毛，先端稍凸出和象的一只凸透镜。
A new type of sensor composed of a silicon-photocell, small bulbs and convex lens for precise detection of reseeding property of a seedmeter was developed. 摘要利用硅光电池、小灯泡以及凸透镜构造了一种用于检测精密排种器排种性能的传感器。
At last,from the reflection imaging theory and the calculating method of the converse light route,this text deduces the easy way to measure this convex lens's optics parameter. 最后,通过薄凸透镜的反射成象原理和逆向光路的计算,推导出测量薄凸透镜的光学参量的简便方法。
A physiotherapeutic apparatus for preventing and treating near sighted eye has a convex lens used as objective lens, lens cone, eyepiece, headgear and lens set. 一种防治近视眼的理疗器，它有作为物镜的凸透镜、镜筒、目镜，还有头套和透镜组，它用于人们在近距离上长时间用眼时戴在眼上，可以使被视物的像清楚、放大和变远。
The delay made the patient go purple in the face. 时间的拖延使病人脸色发紫。
The plant has a brilliant purple flower. 那棵植物开著一朵鲜艳的紫花。