题干

在“验证凸透镜成像规律”实验中,某小组同学利用焦距10cm的凸透镜,高为3cm的发光体,光屏和光具座进行实验,将观察到的像、测得的物距u、像距v以及所成像的高h像分别记录在表中,为了进一步研究,他们进行了一些适量的运算,将结果分别记录在表的后两列中.

实验序号

 物距u/cm

 像距v、cm

 像的倒正

 像高h像/cm

 像距与物 距之比(v/u)

 物距与像距之 和(u+v)(cm)

 1

 60.0

 12.0

倒立

0.60

0.20

72.0

 2

50.0

12.5

倒立

0.75

 0.25

 62.5

3

30.0

15.0

倒立

1.50

0.50

45.0

4

 18.0

22.5

倒立 

 3.75

1.25

40.5

56

 16.0

26.7

倒立 

5.00

 1.67

42.7

 6

 14.0

35.0

倒立

7.50

 2.50

49.0

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同类题2

根据首字母提示,拼写单词。

    Sam and Tom were identical(同样的) twins. They were so identical that even their mother found it d____to tell one from the other. But except for their looks, everything else about them was different.

    Tom had no friends, w____Sam was a great friendship maker. Sam loved sweets, but Tom loved spicy food and h____sweets. Sam was generous and selfless, Tom was greedy and selfish!

    As Sam and Tom grew up, their father wanted to s____his fortune equally. However, Tom did not agree, and he argued that whoever proved to be smarter and stronger would have to get a b____share of the wealth.

    Sam agreed. Their father decided to organize a competition b____the two. He asked the two sons to walk as long as they could, and return home before sunset.

    The following day, Sam and Tom set out to walk. It was a rather sunny day. Sam walked slowly and steadily, while Tom ran q____as he aimed at winning the race and gained a greater portion of his father's wealth.

    Sam knew that it would be ideal to walk as far as possible till noon, and start for home at noon, as it would take the same amount of time to walk back home. K____this, Sam decided to turn back for home at noon so as to reach home on time.

    However, Tom, with his greed to earn more w____ didn't try to return home even after mid-noon. He walked twice as long as Sam, and thought he would still be able to return home before sunset. U____ he lost the race at last only because of his greed.