题目

I recently heard a story about a famous research scientist who had made several very important medical breakthroughs.When a newspaper reporter asked him why he was able to be so much more creative than the average person, he responded that it all came from an experience with his mother when he was about two years old.At that time he was trying to remove a bottle of milk from the refrigerator when he accidentally dropped the bottle, splling its contents all over the kitchen floor—a real sea of milk!When his mother came in, instead of yelling at him, giving him a lecture or punishing him, she 小宇在做“探究凸透镜成像规律”实验，其实验装置的示意图如图所示．a、b、c、d、e是主光轴上的五个点，F点和2F点分别是凸透镜的焦点和二倍焦距点．（l）在a、b、c、d、e这五个点中：①把烛焰放在 点上，可以成正立、放大的虚像．②把烛焰放在 点上，成像最小．③把烛焰放在 点上是属于照相机原理．④把烛焰放在 点上是属于投影仪原理．（2）小字做完实验后，又想用手表代替蜡烛，看在光屏上能成什么样的像．于是他在透明的玻璃板上用黑色笔画了个手表盘，如图（甲）所示．把这个玻璃板放在蜡烛的位置上，并用平行光源对着玻璃板上的表盘照射，如图（乙）所示．移动光屏直到成清晰像为止．此时表盘在光屏上所成的像是图（丙）中 图．