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plano-concave lens /ˈpɪtəŋkˈaɹiə/ n

中文：平凹透镜

中文 · 平凹透镜Español · lentes cóncavo-planasFrançais · lentille plan-concave
Meaning：Lens with one flat side and one concave side (curving inward).
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Concave lens

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