2019届九年级数学上册第五章投影与视图5.1投影(第1课时)课件(新版)北师大版.ppt

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第五章 投影与视图,1.投影,第一课时,1.在同一时刻,不同物体在灯光下的影子可能是在同一方向,也可能在 . 2.灯光光线是发散光线,灯光下的影子与物体的高度 (填“一定”或“不一定”)成比例. 3.下列光线能形成中心投影的有( ) 探照灯;手电筒;路灯;太阳光. A.1个 B.2个 C.3个 D.4个,不同方向,不一定,C,1,2,3,4,1.下列结论正确的有( ) 物体在灯光照射下,影子的方向是相同的;物体在路灯照射下,影子的方向与路灯的位置有关;物体在光线照射下,影子的长短仅与物体的长短有关. A.0个 B.1个 C.2个 D.3个,答案,1,2,3,4,2.在皮影戏的表演中,要使银幕上的投影放大,则下列做法正确的是( ) A.投影灯向银幕相反方向移动 B.剪影向银幕方向移动 C.剪影向投影灯方向移动 D.银幕向投影灯方向移动,答案,1,2,3,4,3.光线可以看成是从一点发出的,像这样的光线形成的投影称为 .,答案,1,2,3,4,4.物体在路灯灯光的照射下,影子的长短跟物体与路灯的 有关,影子的方向与路灯的 有关.,答案,

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