convergence of rays
... convergence mirror 聚光镜 convergence of rays 光线会聚 convergence ration 会聚比 ...
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会聚光线 Convergent
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会聚透镜使光线会聚于一点，即焦点。
A convex lens causes rays to converge on a single point, the focal point.
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To adjust or come to a focus.
凸透镜中心部分比周围要厚，它使光线会聚。
A convex lens is thicker at its center than its periphery. It causes rays to converge.
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