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/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5

    Do you know more and more Chinese artists have made regular donations to charity or put their efforts into charity work in China? Here let's know some of them.

Faye Wong and her husband Li Yapeng started the Yan Ran Angel Foundation for harelipped(兔唇的) children three years ago. It was named after their daughter. Its purpose is to help children under 14 to cure their harelips. The couple donated one million yuan (about $ 133,000) to start the organization.
Cong Fei was born in a poor family. He became a successful singer in Shenzhen. He helped 178 poor students and disabled people for more than 10 years. Before he died of an illness at the age of 37 in 2006, he decided to donate his cornea(角膜) to people with eye diseases. He helped six people see the world.
Guan Mucun has donated money to Project Hope to help poor students finish primary education. Thirty of these poor students have already finished high school with her support. Guan has also helped with charity work for environment protection, HIV/AIDS prevention, blood donation and “Mother Water”.
Guan had an unlucky childhood: her mother died when she was only 10. years old. With the help of the government and her neighbors, she grew up and was successful as a famous singer.
Action star Jackie Chan is a wholehearted supporter of charities including UNICEF, Operation Smile and his own Jackie Chan Charitable Foundation. In 2007, he used much of his spare time to visit the farthest parts of China on his Dragon's Heart Charity Missions.The Dragon's Heart Foundation aims to meet the needs of poor children and the elderly in the hardest-to-reach areas of the country. Chan has made several trips to these poor villages, bringing warm clothing, wheelchairs and school supplies, and helping to build schools.