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初中应用物理知识竞赛涉及“透镜及其应用”知识的主要内容有:透镜对光线的作用,透镜成像规律,凸透镜成像的作图,凸透镜成像在日常生活中的应用等.一、透镜对光线的作用凸透镜对光线有会聚作用,凹透镜对光线有发散作用.同学们一定要深刻理解“会聚”和“发散”的含义:“会聚”是指相对于光线原来的传播方向而言,折射光线偏向主光轴;而“发散”是指相对于光线原来的传播方向而言,折射光线偏离主光轴.另外,在光的折
The junior high school applied physics contests involving “lens and its application ” knowledge of the main contents are: the role of the lens to the light, the lens imaging law, the imaging of convex lens imaging, convex lens imaging in daily life applications. The role of light Convex lens convergence of light, concave lens divergent effect on light. Classmates must have a deep understanding of “convergence ” and “divergence ” meaning: “convergence ” refers to the original light transmission Direction, the refracted light is offset to the main optical axis; and “divergence” means that the refracted light deviates from the main optical axis with respect to the original propagation direction of the light. In addition,