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.
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.
显然,我们希望透镜成一个放大的正象。
Evidently, it would be desirable for the lens to form a magnified, erect image.
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