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[題目]
A beam of unpolarized light, with intensity 43W/m^2, is sent into a system
of two polarizing sheets with polarizing directions at angles θ1=70°and
θ2=90° to the y-axis. What is the intensity of the light transmitted by
the system?
y
│
θ1 └─x
\│／
θ2 ○
\│／
○
／
[瓶頸] (寫寫自己的想法，方便大家為你解答)
解答的算式是寫
In this case, we replace I*(cos70°)^2 by (1/2)*I as the intensity of the
light after passing through the first polarizer. Therefore,
I' = (1/2)*I*[cos(70°-20°)]^2
= (1/2) * 43 * cos20°*cos20°
我想問的是為什麼經過第一片之後會是 二分之一的 I
*剛剛爬了一下文發現 經過Vertical的會變成1/2
可是題目解答怎麼說70度的變1/2 @@"
ps. I一般應該是寫 I 可是比較難打所以改符號XD
°
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◆ From: 140.115.214.104
※ 編輯: LansingAltec 來自: 140.115.214.104 (06/21 21:50)
※ 編輯: LansingAltec 來自: 140.115.214.104 (06/21 21:51)
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