Ability of Drawing and Understanding Ray Diagrams for Convex Lenses

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  • 凸レンズが作る実像・虚像に関する作図能力と理解状況
  • トツレンズ ガ ツクル ジツゾウ キョゾウ ニ カンスル サクズ ノウリョク ト リカイ ジョウキョウ

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<p>This study aimed at investigating how newly introduced teaching materials facilitated students' ability of drawing and understanding ray diagrams for convex lenses. Science (n=31) and education (n=130) undergraduates and junior high school students (n=43) completed a questionnaire on how they drew ray diagrams for convex lenses. Students' ability and their understanding were evaluated both before (pre-test) and after (post-test) reading the teaching materials. We obtained the following four results: 1. Pre-test results revealed that more than 70% of science undergraduates (real image: 97%, virtual image: 90%) and junior high school students (real image: 81%, virtual image: 70%) were able to draw scientific ray diagrams for convex lenses. 2. In the pre-test, both science and education undergraduates tended to think that they would be able to draw scientific ray diagrams but may not understand them. In the post-test, almost all of them confirmed that they could both draw as well as understand scientific ray diagrams. 3. Post-test results revealed that 84% of science and 65% of education undergraduates were able to draw scientific ray diagrams for convex lenses, even when portions of the lens were covered. Moreover, 40% of education undergraduates could completely explain how the object can be seen under a light microscope. 4. Junior high school students, on the other hand, barely acquired new knowledge despite reading the teaching materials; as a result they were unable to answer the advanced task well.</p>

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