如图所示把一反射面�上的凹镜置于容器内有一束平行光线以凹镜反射后会聚在a点如果�容器内加一些水将凹镜恰好浸没在水中则该光束的会聚点a Template




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tomski如图所示把一反射面�上的凹镜置于容器内有一束平行光线以凹镜反射后会聚在a点如果�容器内加一些水将凹镜恰好浸没在水中则该光束的会聚点a coloring