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1、(1)10;(2)上;(3)放大 幻灯机
2、B(提示:根据u>2f时成缩小实像)
3、15 d
4、8 左 照相机 (提示:根据2f时物距与像距相等)
5、(1)同一高度;(2)清晰;(3)10(提示:根据2f时物距与像距相等);(4)光屏一侧 放大 放大镜
6、A(提示:根据成缩小实像时u>2f)
7、A(提示:如图1所示)
8、10 4cm/s(提示:根据2f时物距与像距相等或者物距越大像距越接近f;像移动的距离为20cm-12cm=8cm)
9、A(提示:根据2f时物距与像距相等;像是实际光线的会聚点)
10、红 凸透镜(或三棱镜)对红光的偏折(或折射)程度最小(或回答的理由是将凸透镜与三棱镜加以对比,或者将凸透镜等效为两个三棱镜及平行玻璃砖的组合均正确)