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Two kinds of convex lens which make parallel 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.
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结论配戴低度凸透镜可降低小学生近视的发生率.
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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.
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Methods Hypermetropia and myopia were induced by 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.
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利用矩阵光学方法，分别推导了高斯光束经双平凸镜耦合简和自聚焦微透镜两种耦合系统聚焦后的束腰宽度和像距的计算公式。
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Having greater curvature on the concave side than on the convex side . Used of a lens.
凹凸的凹面曲率大于凸面曲率的.
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