凸透镜成增加的物像视野愈大，像也愈大，愈能辨别物的细节。移近物体可增加视野，但遭受双眼变焦水平的局限。而凸透镜是1种多见的镜片，中间厚、边缘薄，至少有一个表层制成而成球体，也可以双面都制成而成球体，恰好是具有增加的功能，倍率之间不等。
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