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歡迎您訪問數學考題練習:下面四幅圖中,中的燈光與影子的位置是最合理的.!

數學考題練習:下面四幅圖中,中的燈光與影子的位置是最合理的.

更新時間:2024-01-12 16:45:22作者:貝語網校

下面四幅圖中,中的燈光與影子的位置是最合理的.

A.

B.

C.

D.

試題答案

B

試題解析

根據中心投影的特點可知,連接物體和它影子的頂端所形成的直線必定經過點光源.所以燈光與物體的影子是最合理的是B

解答:連接物體和它影子的頂端所形成的直線必定經過點光源.故選B.

點評:本題綜合考查了中心投影的特點和規律.中心投影的特點是:①等高的物體垂直地面放置時,在燈光下,離點光源近的物體它的影子短,離點光源遠的物體它的影子長.②等長的物體平行于地面放置時,在燈光下,離點光源越近,影子越長;離點光源越遠,影子越短,但不會比物體本身的長度還短.

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