释义 |
DictionarySeefocal pointposterior focal point
pos·te·ri·or fo·cal pointthe point of a compound optic system where parallel rays entering the system are focused.pos·te·ri·or fo·cal point (pos-tēr'ē-ŏr fō'kăl poynt) The point of a compound optic system where parallel rays entering the system are focused. |