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这是因为镜片各部分有不同的放大倍率所致。
It is due to the fact that different area of the lens produce different magnification.
youdao
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长方形槽上方与侧面的放大图，放大倍率为200倍。
Top and side view of the slot with the magnification of 200x.
youdao
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长方形槽上方与侧面的放大图，放大倍率为200倍。
Top and side view of the slot with the magnification of 200x.
youdao