The image character of an erect object was analyzed and the image equation of it was provided.
分析了竖直物像的特征并给出了畸变像的方程；
Evidently, it would be desirable for the lens to form a magnified, erect image.
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.
显然，我们希望透镜成一个放大的正象。
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