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材料 厚的小凸透镜(直径约1.5厘米) 薄的大凸透镜(直径约4厘米) 纸筒(直径约2.5厘米,长约22厘米) 较大些的纸筒(直径约4厘米,长约22厘米)一小张纸板(用来固定小透镜) 胶水 条状毡子
Material Small convex lens (about 1.5 cm in diameter) Large convex lens (about 4 cm in diameter) Paper tube (about 2.5 cm in diameter and 22 cm in length) Larger paper tube (about 4 cm in diameter and about 22 cm in length A small piece of cardboard (used to fix the lens) glue strip mat