物理　多重反射

我是中四學生，有學optics，而你所說的公式其實在現時CEE syllabus內是out sy的。
幸好，我老師上課時不經意提及過，而幸好，我有把公式抄寫下來，又幸好，我的notes還在……

formula required is as followed:

n = 360˚/θ - 1
Where
n is the no. of images formed; and
θ is the angle made between the 2 mirrors.

For example, if 2 mirrors form an angle of 90˚, the no. of images formed by the two is
360˚/90˚ - 1 = 4 - 1 = 3



Hope these help. =]]]

2008-05-29 08:41:28 補充：
I have calculated, and the answer for θ = 80˚ should be 3.5 instead.
I am figuring why...

2008-05-29 09:58:30 補充：
Now I understand why.
The above formula is valid only if θ is a factor of 360˚. Since 80˚ is NOT a factor of 360˚, the formula no longer holds.

http://www.phy.ntnu.edu.tw/oldjava/optics/image_e.html

You may try this web, it demonstrates how mutiple-refletions occur.