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u是物距,f是焦距. 拿照相機來說,你照一棵樹,樹到你照相機的鏡頭之間的距離就是物距. 照相機鏡頭到照相機後面成像的那段距離叫像距,像距的字母是v. 凸透鏡能使跟主光軸平行的光會聚在主光軸上的一個點,這個點就是焦點,焦點到凸透鏡光心的距離叫做焦距.凸透鏡兩側各有一個焦點,兩側的兩個焦距相等. 不懂追問哦~
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