Al physics:multi slits

A Maths student

2010-05-30 8:11 pm

In the following picture,why does the second,third and fourth picture drawn like this?

圖片參考：http://h.imagehost.org/0388/phytestwave3.jpg

更新1:

http://h.imagehost.org/0388/phytestwave3.jpg

更新2:

but why when n=3,the graph consists of some small crest? Is it because of the resultant of waves?

回答 (1)

天同

2010-05-30 8:59 pm

✔ 最佳答案

I wonder if there is misprint in your diagrams. N should be greater than 2 in the second and third diagrams.
Just look at the following web-page by selecting the no. of slits:

http://hyperphysics.phy-astr.gsu.edu/Hbase/phyopt/mulslidi.html#c3

2010-06-02 09:04:20 補充：
The small crests are due to incomplete destructive interference of light from the 3 slits. The mathematical formula describing the resultant intensity is rather complex. You may refer to the following web-page:

http://hyperphysics.phy-astr.gsu.edu/Hbase/phyopt/gratint.html#c1

👍 0 👎 0