如图所示，将一块薄玻璃板竖直架在一把直尺的上面，再取两支等长的蜡烛A和B，分别竖放在玻璃板前后的直尺上，点燃玻璃板前的蜡烛A，移动玻璃板后的蜡烛B，并如图那样观察，当蜡烛B移到与蜡烛A在玻璃板里的像重合时，蜡烛B好像也被点燃了．
（1）由直尺分别读出玻璃板到物（蜡烛A）、玻璃板到像（即到蜡烛B）的距离分别为u和v，得到的结果是u______v．（填“＞”、“=”或“＜”）
（2）移去蜡烛B，并在其所在位置上放一光屏，这时，观察者直接对屏观察，看不到蜡烛A的像，由此可知平面镜所成的像是______．
（3）用玻璃板代替平面镜的目的是______．
（1）物和像到镜面的距离是相等的．
（2）移去蜡烛B，并在其所在位置上放一光屏，这时，观察者直接对屏观察，看不到蜡烛A的像，由此可知平面镜所成的像是虚像．
（3）用玻璃板代替平面镜的目的是便于确定出像的位置．
故本题答案为：=，虚像，便于确定出像的位置．
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It was five in the afternoo n. A bus 1 a small town. Mrs Morison got off and went in a restaurant by the road, with a small beautiful dog, she was travelling in 2 , she looked for her dog at noon and missed her lunch. So she was 3 now and wanted to have something there. The waiter received the visitor 4 . But he knew little English and the woman couldn't speak French. They talked for a while 5 couldn't understand each other. She had to point to her 6 and then slapped (拍)the dog's belly (肚子). The waiter seemed to know 7 she wanted and carried the dog into the kitchen. About half an hour some dishes were brought to the woman. They were all 8 and she was pleased with them. After she paid for her bill. She didn't leave she waited for a while and said 9 to the waiter and they began to quarrel (争吵). Just at that moment the manager came back. He talked with the woman and then with the waiter. At last he understood. The English woman told the waiter to 10 her dog, but he thought she told him to cook it for her! | ||||
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