作者kevin60405 (廷廷)
看板Physics
标题[问题] 双狭缝绕射问题
时间Wed Oct 7 23:53:53 2009
这是Haliday普物中的叙述
In the double-slit experiment of Chapter 35, we implicitly assumed thar the
the slit were much narrower than the wavelength of the light illuminating them;
that is, a<<λ. For such narrow slits the central maximum of the diffraction
pattern of either slit covers the viewing screen.Moreover, the interference of
light from the two slits produces bright frines with appoximately the same
intensity.
文中说到当入射波长远大於狭缝宽度 还是会有干涉条纹
而且此时强度不随空间分布
可是我以前学的是 当入射波长大於狭缝宽度时 会呈现消散波的形式
波行进不到几个波长就没了 更不要说波长"远大於"狭缝宽了
那haliday作者的解释是怎麽一回事....
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◆ From: 125.225.19.123
※ 编辑: kevin60405 来自: 125.225.19.123 (10/07 23:54)
1F：→ leo80042:会不会是你把"狭缝宽度"和"狭缝间距"搞混了? 10/08 00:48
2F：→ leo80042:高中学的双狭缝干涉是假设狭缝宽度很小，没有单狭缝绕射 10/08 00:49
3F：→ leo80042:效应。但若把狭缝宽度也考虑进来，看到的条纹是干涉和绕 10/08 00:49
4F：→ leo80042:涉结合在一起。(好久没念了，有错请指正谢谢^^") 10/08 00:50
5F：→ grind:你实在很行....消逝场马上又变成你以前学的... 10/08 00:56
6F：→ grind:first of all, the scale of evanescent wave and that of 10/08 00:57
7F：→ grind:diffraction are much different, about several orders.... 10/08 00:58
8F：→ grind:the auther just talked about the "viewing screen". 10/08 00:58
9F：→ grind:the slit width, a, is about one-tenth and the viewing 10/08 00:59
10F：→ grind:screen will be smaller than the central bright zone. 10/08 01:00
11F：→ grind:so that we don't take diffraction in consideration, when 10/08 01:01
12F：→ grind:we are having a experiment of double-slit interferrence 10/08 01:02
13F：→ grind:with a quite small slit width. 10/08 01:03
14F：→ kevin60405:不太懂 所以就算波长>>狭缝宽 还是有干涉条纹? 10/08 17:14