第八届“希望杯”高一2试第19题: 平行光线照射到一个棱长为1的正方体上,在正方体后面的平面上留下的影子的面积为S,则S的最大值为______. 此题的叙述使人费解:正方体后面的平面是什么位置?平行光线与此平面成多大的角度?都没有说明,这种情况下我们可以认为S是趋向于无穷大的,这恐怕不是命题者的本意.所以本题是否应为 The 8th “Hope Cup” High School 2 Test Question 19: The parallel light is irradiated to a cube with an edge length of 1. The area of ​​the shadow behind the cube is S. The maximum value of S is _ _____. The narrative of this question makes people understand: what position is the plane behind the cube? How large is the angle between the parallel light and this plane? There is no explanation. In this case we can think that S tends to infinity, which is probably not the proposition. The intention of the person. So whether this question should be