人在灯光下走动,当人远离灯光时,其影子的长度将_______ .(填“变长”或“变短”)
更新时间:2023-12-29 11:11:18
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【推荐1】如图是圆桌正上方的灯泡O发出的光线照射桌面后,在地面上形成阴影(圆形)的示意图.已知桌面的直径为1.2m,桌面距离地面1m,若灯泡O距离地面3m,则地面上阴影部分的面积为_____ m2.
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