【have a look at this picture】怎么用这张图证明凹面镜焦点在1/2半径处?
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【have a look at this picture】怎么用这张图证明凹面镜焦点在1/2半径处?
![](http://img.wesiedu.com/upload/1/70/170aac20317b7d3fee76c06cd469a628.jpg)
![](http://img.wesiedu.com/upload/1/70/170aac20317b7d3fee76c06cd469a628.jpg)
![【have a look at this picture】怎么用这张图证明凹面镜焦点在1/2半径处?](/uploads/image/z/1205707-67-7.jpg?t=%E3%80%90have+a+look+at+this+picture%E3%80%91%E6%80%8E%E4%B9%88%E7%94%A8%E8%BF%99%E5%BC%A0%E5%9B%BE%E8%AF%81%E6%98%8E%E5%87%B9%E9%9D%A2%E9%95%9C%E7%84%A6%E7%82%B9%E5%9C%A81%2F2%E5%8D%8A%E5%BE%84%E5%A4%84%3F)
有几何关系和光反射定律得θ₁=θ₂,所以等腰三角形,因为R极大,所以θ极小近似认为f=R/2,求采纳
【have a look at this picture】怎么用这张图证明凹面镜焦点在1/2半径处?
凹面镜的焦点在哪?在1/2半径上,还是?用几何证明一下!
look at this picture
Let( )have a look at the picture
Let me have a __________ this picture A:look at B:see C:watc
Let's have a look at this new picture.如何回答?
bring me 空格 please i want to have a look at this picture
Please have a ( )at this picture
Look at the picture.Is this your mother?怎么回答
Let me have a look at the picture 反义疑问句怎么写
根据答句写问句A:Look at this picture.______________________________
have a look at the picture的同义句