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因為太陽離地面非常遠,而小孔又非常小,符合小孔成像的條件,當太陽光沿直線傳播經過小孔時會形成太陽的像(圓形的),也就是我們見到的地面上的光斑,小孔成的像是倒立的實像,與物體的形狀相同,與小孔的形狀無關.故選C.
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