问题 选择题

简易潜望镜中的两块平面镜中心点之间的距离为L,通过潜望镜观察水平正前方的物体,看到像的位置比物体的实际位置(  )

A.水平方向远L,竖直方向低L

B.水平方向远L,竖直方向高L

C.水平方向近L,竖直方向高L

D.水平方向近L,竖直方向低L

答案

作出光路图如图所示.

根据平面镜成像规律,AB与其在M1镜的像A′B′关于M1对称,A′B′对于M2镜为物,它的像A″B″距O2距离为L+h,所以A″B″距AB水平距离为L.由图看出,看到像的位置比物体的实际位置水平方向远L,竖直方向低L.故A正确,BCD错误.

单项选择题
阅读理解

Mr. Black and Mr. White were two very famous artists in the city. Their drawings were also very popular in the city. But they tried to see who could draw the best picture.

One day they asked an old man to be the judge. Mr. Black drew an apple tree. He put his picture in the field. Soon the birds came and tried to eat the apples. The old man saw it and said, “You have certainly won. Mr. White cannot draw so good a picture as yours. But we will go to see his picture.”

They went to Mr. White’s house. There were nothing but red beautiful curtains on the wall. The old man asked, “Where is your picture, Mr. White?” He said, “Lift the curtains, and you will find my picture.” The old man tried to lift the curtains but found that they were drawn there. They were Mr. White’s picture. The old man said, “Birds thought the apples were real. Men thought the curtains were real. So Mr. White won. His picture is the best one.”

小题1:Mr. Black drew       .

A.an apple tree

B.the best picture

C.curtains

D.birds小题2:The old man thought Mr. Black’s picture was good because       .

A.it was in the field

B.it was an apple tree

C.the birds liked it

D.the birds thought it was real小题3:Mr. White’s picture was       .

A.an apple tree

B.curtains

C.nothing

D.an old man小题4:Which of the following statements is TRUE?

A.The birds came and ate the apples up.

B.The old man said Mr. White’s picture was the best one at last.

C.The two pictures were not so good.

D.The curtains on the wall were real.