问题 问答题

在“探究凸透镜成像的规律”的实验中.

(1)小文同学的实验数据如下表,请填出空格处的内容.

物距(u)

像的性质

应用

  同侧或异侧  正立或倒立  放大或缩小  虚像或实像
   u<f    正立    放大    虚像  放大镜
f<u<2f    异侧倒立    放大    实像  幻灯机
   u>2f    异侧    倒立    缩小
(2)探究结论:凸透镜成实像的条件______.

答案

(1)u<f,成正立、放大的虚像,物像在凸透镜的同侧,应用于放大镜.

u>2f,成倒立、缩小的实像,物像在凸透镜的异侧,应用于照相机.

(2)凸透镜成实像时,u>f.

故答案为:(1)同侧;实像;照相机;(2)u>f.

阅读理解

阅读理解。

     Last year, I was invited to attend a party for "Tuesday's Child", an organization that helps children with

the AIDS virus. I was asked to attend because I am on a TV show. I went there because I care.

     At the party, they had all kinds of small rooms. I got into a special one. In this room, anyone could paint

a square. They gave everyone paints in bright, beautiful colours and asked the kids to paint something beautiful.

As I looked around at all the squares, I saw the pictures were all bright, except one. 

    The boy sitting next to me was painting a heart, but it was dark, empty, and lifeless. It lacked the bright

colours that other children used. 

    At first I thought maybe he took the only paint that was left and it just happened to be dark. But when I

asked him about it, he said his heart was that colour because his own heart felt dark. I asked him why and

he told me that he was very sick and his mother was very sick, too. He said that his sickness was not ever

going to get better and neither was his mother's. He looked straight into my eyes and said, "There is nothing

anyone can do to help."

    I told him I was sorry that he was sick and I could certainly understand why he was so sad. I could even

understand why he had made his heart a dark colour. But I told him that it isn't true that there is nothing

anyone can do to help. Other people may not make him or his mother better but we can do things like giving

him or her hugs. Then I hugged him for a long time. I thought my own heart would burst with the love I felt

for this sweet little boy. After that, I asked him if he felt any better. He said he did, but he was still sick and

nothing would change that. I walked away feeling sad.

     As I was getting ready to head home, I felt a tug on my jacket. I turned around and the little boy was

standing there with a smile on his face. He told me, "My heart is changing colours. It is getting brighter.

I think those hugs really work."

     On my way home, I felt my own heart had changed to a brighter colour.

1. "Tuesday's Child" was _____. [ ]

A. the name of a TV show

B. the name of an organization

C. a child with the AIDS virus

D. the name of a party

2. The writer _____ so she wanted to attend the party. [ ]

A. was invited

B. worked for a TV show

C. cared for the sick children

D. was very careful

3. The sick boy painted a dark heart because _____. [ ]

A. he is not good at painting

B. he took the only paint that was left

C. his mother was dying

D. he as well as his mother was seriously ill

4. After a long hug, _____. [ ]

A. the boy felt better

B. the writer felt her heart had changed brighter

C. nothing happened

D. the boy wasn't sick any more

5. The underlined word "burst" in paragraph 5 means _____. [ ]

A. break suddenly

B. come into

C. be filled

D. feel

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