問題詳情
有一凸透鏡與一屏相距 12 公分，有一物體經此透鏡所成之實像正落於屏上，如果將透鏡離物體移遠 2 公分，屏應向物體移近 2 公分，始又可生實像於屏上，則此透鏡之焦距為 ________公分。
參考答案
答案：B
難度：適中0.644588
統計：A(86),B(399),C(13),D(121),E(0)
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