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一、基本原则１．符号的命名（１）会聚光线和凸透镜（会聚透镜）规定为“正”．（２）发散光线和凹透镜（发散透镜）规定为“负”．（３）平行光线规定为“０”．（４）光线或透镜会聚程度很高（连续两次），则用“２正”表示；光线或透镜发散程度很高（连续两次），则用...
First, the basic principle Naming of symbols (1) Convergent rays and convex lenses (converging lenses) are defined as “positive”. (2) The divergent rays and the concave lens (divergent lens) are defined as “negative”. (3) The parallel light is defined as “0”. (4) The light or lens is highly converging (twice in a row) and is expressed as “2 positives”; the light or lens is highly divergence (twice in a row), then...