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8614(86日大)某一物體位於一凸面鏡主軸上

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Uploaded by on Jul 2, 2008

(86日大-8614)某一物體位於一凸面鏡主軸上,離頂點20公分。若所成的虛像離頂點10公分,則此凸面鏡之曲率半徑為_____。

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