homocentric beam

• 1. 同心光束: homocentric pencil of rays | concentric beam | homocentric beam

• 1.当入射光束与出射光束平行时，单色同心光学系统空间任一点成几何理想像。
  If a monocentric system existed for which an incident collimated beam emerged as exactly collimated, then the system would give geometrically perfect imaging of any point in space.
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