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求解，理化4-1,光的傳播

右圖為桌面邊長為2m的正方形書桌,其高度為1.2m,而桌 面的中心上方掛著小燈泡,當燈光向下投射時,地面上產生 面積為9平方公尺的正方形影子,若小燈泡可視為點光源, 則小燈泡距離桌面高度為多少公尺? (A) 1.2 (B) 1.8 (C) 2.4 (D) 3.6 1.2m
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