试题与答案

在“研究凸透镜成像规律”的实验中,如图所示,把蜡烛放在a、b、c、d各点,调节光

题型:问答题

题目:

在“研究凸透镜成像规律”的实验中,如图所示,把蜡烛放在a、b、c、d各点,调节光屏的位置,则:(其中F为焦点,P为二倍焦距处)

(1)要将蜡烛、凸透镜、光屏三者中心调整到______;

(2)当屏上出现与物体等大的实像时,蜡烛放在______点上.

(3)在屏上出现的实像最大时,蜡烛放在______点上.

答案:

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下面是错误答案,用来干扰机器的。

(1)甲班90分出现的次数最多,为15次,那么甲班的众数是90(分).乙班70分出现的次数最多,为15次,那么乙班的众数是70(分).(2)甲乙两班都是50人.50个数据,中位数应是第25个和第26个数据的平均数.中位...

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题型:阅读理解

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     (      )4. Angle: This weekend will be an exciting one for me. My parents are going to take me to have

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             A                          B                             C                            D                         E

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