摘要：C 15.A 16.A
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A、小明用凸透镜、蜡烛、光屏和刻度尺等器材，探究凸透镜成像的规律．
图1 图2
（1）如图1所示，将凸透镜正对着太阳光，把光屏置于另一侧，改变光屏与凸透镜间的距离，直到光屏上出现一个
（2）实验中，小明无论怎样移动光屏，都不能在光屏得到像原因可能是
（3）实验一段时间蜡烛变短，要使烛焰像仍然成在光屏的中心，应将光屏向_
B、在“探究凸透镜成像规律的实验”中，将蜡烛、焦距等于10cm的凸透镜、光屏放在光具座上，如图2所示，调节烛焰、凸透镜和光屏的中心在同一高度，把凸透镜固定在50cm处．
（1）将蜡烛放在A点，光屏在B位置上，为了找到清晰的像，应将光屏向
（2）依次改变蜡烛的位置，移动光屏，直到找到清晰的像．记录的数据如下表．
①在1-4次实验中，所成的像为倒立、
②第6‘次的像比第5次的
（3）将蜡烛放在C点，观察到烛焰的正立、放大的虚像后，若希望看到更大的虚像，应将蜡烛向
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图1 图2
（1）如图1所示，将凸透镜正对着太阳光，把光屏置于另一侧，改变光屏与凸透镜间的距离，直到光屏上出现一个
最小最亮的
最小最亮的
光斑，测得凸透镜的焦距是10
10
cm．（2）实验中，小明无论怎样移动光屏，都不能在光屏得到像原因可能是
物体在凸透镜的一倍焦距以内
物体在凸透镜的一倍焦距以内
．（3）实验一段时间蜡烛变短，要使烛焰像仍然成在光屏的中心，应将光屏向_
上
上
移动．B、在“探究凸透镜成像规律的实验”中，将蜡烛、焦距等于10cm的凸透镜、光屏放在光具座上，如图2所示，调节烛焰、凸透镜和光屏的中心在同一高度，把凸透镜固定在50cm处．
（1）将蜡烛放在A点，光屏在B位置上，为了找到清晰的像，应将光屏向
左
左
（填“左”或“右”）移动．（2）依次改变蜡烛的位置，移动光屏，直到找到清晰的像．记录的数据如下表．
| 次数 | 1 | 2 | 3 | 4 | 5 | 6 |
| 物距（cm） | 40 | 35 | 30 | 25 | 20 | 15 |
| 像距（cm） | 13.5 | 14 | 15 | 16.7 | 20 | 30 |
缩小
缩小
的实像．②第6‘次的像比第5次的
大
大
（填“大”或“小”）．（3）将蜡烛放在C点，观察到烛焰的正立、放大的虚像后，若希望看到更大的虚像，应将蜡烛向
左
左
（填“左”或“右”）移动．如图15是某同学测定小灯泡功率的实验电路图，所用器材完好，小灯泡上标有“0.2 A”字样。该同学闭合开关后，移动滑动变阻器的滑片，发现甲表反向偏转，乙表指针不动且小灯泡不亮。该同学经思考、分析后，重新进行实验，使小灯泡正常发光，这时电压表的示数如图16所示。
（1）实验操作时，闭合开关前滑动变阻器的滑片应滑至 （选填“C”或“D”）处。
（2）本实验中电流表应选用 （选填“大”或“小”）量程。
（3）简要分析该同学初次实验中错误的原因是 。
（4）小灯泡正常发光的额定功率为 瓦特。
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如图15是某同学测定小灯泡功率的实验电路图，所用器材完好，小灯泡上标有“0.2 A”字样。该同学闭合开关后，移动滑动变阻器的滑片，发现甲表反向偏转，乙表指针不动且小灯泡不亮。该同学经思考、分析后，重新进行实验，使小灯泡正常发光，这时电压表的示数如图16所示。
（1）实验操作时，闭合开关前滑动变阻器的滑片应滑至 （选填“C”或“D”）处。
（2）本实验中电流表应选用 （选填“大”或“小”）量程。
（3）简要分析该同学初次实验中错误的原因是 。
（4）小灯泡正常发光的额定功率为 瓦特。
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（1）实验操作时，闭合开关前滑动变阻器的滑片应滑至 （选填“C”或“D”）处。
（2）本实验中电流表应选用 （选填“大”或“小”）量程。
（3）简要分析该同学初次实验中错误的原因是 。
（4）小灯泡正常发光的额定功率为 瓦特。
查看习题详情和答案>>
There was a boy who was sent by his parents to a boarding school (寄宿学校). 36 being sent away, this boy was the 37 student in his class. He was at the top in every 38 always with high marks.
But the boy changed after 39 home and attending the boarding school. His grades started 40 . He hated being in a 41 . He was lonely all the time. And there were especially dark times when he 42 committing suicide (自杀). All of this was because he felt 43 and no one loved him.
His parents started 44 about the boy. But they even did not know what was 45 with him. So his dad decided to travel to the boarding school and 46 him.
They sat on the bank of the lake near the school. The father started asking him some casual questions about his classes, teachers and 47 . After some time his dad said, “Do you know, son, why I am here today?”
The boy answered back, “To 48 my grades?”
“No, no,” his dad replied. “I am here to tell you that you are the most 49 person for me. I want to see you 50 . I don’t care about grades. I care about you. I care about your happiness. YOU ARE MY LIFE.”
These words 51 the boy’s eyes to be filled with tears. He 52 his dad. They didn’t say anything to each other for a long time.
Now the boy had 53 he wanted. He knew there was someone on this earth who cared for him deeply. He 54 the world to someone. And today this young man is in college at the top of his class and no one has ever seen him 55 !
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But the boy changed after 39 home and attending the boarding school. His grades started 40 . He hated being in a 41 . He was lonely all the time. And there were especially dark times when he 42 committing suicide (自杀). All of this was because he felt 43 and no one loved him.
His parents started 44 about the boy. But they even did not know what was 45 with him. So his dad decided to travel to the boarding school and 46 him.
They sat on the bank of the lake near the school. The father started asking him some casual questions about his classes, teachers and 47 . After some time his dad said, “Do you know, son, why I am here today?”
The boy answered back, “To 48 my grades?”
“No, no,” his dad replied. “I am here to tell you that you are the most 49 person for me. I want to see you 50 . I don’t care about grades. I care about you. I care about your happiness. YOU ARE MY LIFE.”
These words 51 the boy’s eyes to be filled with tears. He 52 his dad. They didn’t say anything to each other for a long time.
Now the boy had 53 he wanted. He knew there was someone on this earth who cared for him deeply. He 54 the world to someone. And today this young man is in college at the top of his class and no one has ever seen him 55 !
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