Science
Junior High
求解，理化4-1,光的傳播
若有一不透明的物體面積10cm,將其置於距離點光源
50cm處,如右圖所示,則距該物體後方150cm的牆壁
上,會出現多少平方公分的影子?
(A) 80 (B) 120 (C) 160 (D) 200
50cm
150cm
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