从椭圆的焦点出�的光线经过椭圆反射后经过另一个焦点，怎样形象的证明这个性质？ Sketch Coloring Page

从椭圆的焦点出�的光线经过椭圆反射后经过另一个焦点，怎样形象的证明这个性质？ Template

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图11是光线经过透镜后的偏折情况请在图中的方框填上适当的透镜——青夏教育精英家教�—— sketch template

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