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範例:平面鏡的成像原理[97學測]

一般家用平面鏡是由一定厚度的透明玻璃片,在其中一面鍍上不透光金屬膜製成。小明注意到若用鉛筆尖直接抵住鏡面時,鉛筆尖的像與筆尖有一小段距離,估計該小段距離是鏡面玻璃片厚度的兩倍。依據上述,家用平面鏡使物體成像的主因,是下列敘述的哪一項?(A)由光在透明玻璃片表面反射造成(B)由光在透明玻璃片表面折射造成(C)由光進入且透過透明玻璃片,再被另一面的玻璃面反射造成(D)由光進入且透過透明玻璃片,再被塗在另一玻璃面上的不透光金屬膜反射造成

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