問題詳情
一凸透鏡之半徑為 10 公分，焦距為 20 公分，置一 2 燭光之點光源在透鏡前 30 公分處，則在透鏡後 10 公分處之屏幕上亮區之面積為___________平方公分。
參考答案
答案：C
難度：適中0.455487
統計：A(58),B(35),C(220),D(118),E(0)
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