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【简答题】
仔细观察比较老花眼镜的镜片与近视眼镜的镜片,分析比较下图所示的一些透镜的截面图。 (l)老花镜的镜片是中间厚还是边缘厚?近视眼镜呢? (2)凡是中间凸出来的都是凸透镜,中间凹进去的都是凹透镜,这种说法对吗? (3)什么样的透镜是凸透镜?什么样的透镜是凹透镜?
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举一反三
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