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求鏡子底部與地面最大的距離
Jun 3rd 2013, 10:13

http://blog.yahoo.com/_4GG3HFQWHNEEX6L5TLYVAMUZDI/photos/1161097#carousel
志強從一塊度為0.4m的平面鏡觀看懸在牆上的時鐘,他的眼睛與鏡子的水平距離為1m,與地面的距離則為1.2m.已知平鏡和志強背後的牆壁相距4m.時鐘底部距離地2.4m,而時鐘的長度為0.4m

若志強能從平面鏡中看到整個時鐘的像，求鏡子底部與地面最大的距離

感謝

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