青岛版小学科学《照相机和眼睛》教学设计.doc

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1、青岛版小学科学照相机和眼睛教学设计3、眼睛和照相机青岛版小学科学照相机和眼睛教学设计一、课前准备教师准备：照相机两个（光学照相机和数码照相机）、视觉形成演示器、制造土照相机的材料（三张硬纸卡、双面胶、凸透镜、半透明纸或毛玻璃等。）二、教学目标1、通过制作土照相机，培养学生的观察能力和分析推理能力。2、了解一些现代科学技术的应用和发展方面的知识，激发他们学科学、用科学的兴趣。 3、指导学生认识照相机和眼睛的主要结构及其功能；并通过对照相机和眼睛进行类比，使学生知道照相机是仿照眼睛成像的原理设计而成的，初步了解照相机和眼睛的成像原理。三、教学过程（一）导入新课 课始，用数码照相机给学生照相，并通过

2、电脑展示出来让学生欣赏，激发学生兴趣导入新课。（二）探究新知1、质疑：同学们知道照相机是怎样拍摄出照片的吗？ 根据学生的交流，出示照相机，通过拆装照相机，引导学生认识照相机的构造。（镜头、光圈、快门、胶片等。根据学生的已有知识和生活经验，探究照相机是怎样照相的。）小结：照相机就是根据凸透镜成像的原理制成的。2、激趣制作土照相机，进一步了解照相机成像的原理。（制作土照相机比较麻烦，教师可根据实际情况为学生提供土照相机的制作材料，并播放视频片段让学生了解如何制作土照相机。制作好照相机后让学生观察，了解成像规律。）3、认识眼睛的构造，探究我们是怎样看到物体的。（1）谈话：我们的身体就有一架精密的照相

3、机，大家知道是哪里吗？（眼睛）（2）出示眼球构造示意图，交流眼睛的构造。（眼睑和眼球）（3）探究眼睛成像的原理想一想：眼睛和照相机有哪些相似的地方？晶状体、视网膜、瞳孔分别相当于照相机的什么部件？它们各有什么作用？从而让学生总结我们的眼睛是如何看见物体的。（4）小结：眼睛之所以能看见周围的各种物体，一是必须有光，二是眼球内可以成像的构造。当我们睁开眼睛，从周围物体发射或反射而来的光，穿过瞳孔和晶状体，聚集在眼睛后面的视网膜上，形成这些物体的像。连接视网膜的视神经立即把这些信息传送到大脑，所以我们就能看到这些物体。（5）质疑：外界物体在视网膜上形成的像是倒立的，为什么我们眼中看到的却是正立的？让

4、学生结合资料卡了解其中的道理。（三）出示视觉形成演示器，让学生观察并解释其现象，巩固所学知识。四、拓展延伸眼睛是心灵的窗口，对我们非常重要。出示2001-2006 鹿野学校学生平均视力统计表，让学生观察后交流如何保护我们的眼睛。结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！16.58dh.wwsntvsetke0i901jp2ilg2fl10n6czxf9xgwuym7hfrylkhrbtvagn,7dxq77zehbqz3tphmqz3to00v31f72rwbw.vmzzl,rvnj77qymc9i5.5lx8a.wrk5z6pkd

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