Just as a double convex lens enlarges so a double concave lens reduces.
2
目的：观察凹透镜和凸透镜对豚鼠眼球生长和屈光变化的影响，建立透镜诱导型屈光不正动物模型。
Objective: to observe the effect of concave and convex on growing and the refractive developing of guinea pig eyes and to establish lens-induced animal model of myopia or hyperopia.
3
正象双凸透镜可以放大那样，双凹透镜也可以缩小。
Just AS a double convex lens enlarges, so a double concave lens reduces.
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