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Three polarizers are arranged as shown in the figure

  • Thread starter MozAngeles
  • Start date
  • #1
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Homework Statement


Three polarizers are arranged as shown in the figure. If the incident beam of light is unpolarized, and has an intensity of 1.60 W/m2, find the transmitted intensity for each of the following cases.

25-29alt.gif


(a) θ2 = 29.6° and θ3 = 44.0°
(b) θ2 = 44.0° and θ3 = 29.6°

Homework Equations


I= 1/2I0
I= I0cos2θ

The Attempt at a Solution



So what I did what for the first area i used
I= 1/2I0 and I got .8
then I2= .8cos2(29.6)= .6048
then for I3= .6048cos2(44.0) =.2918

then i did the same for part b only switched the theta as needed.

Both of the answers are wrong. Ive been trying to think of why this could be wrong. I have tried many different ways, but this seems to be the one that makes most sense to me. If i could get any help that would be nice. Thanks in advance.

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Redbelly98
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The Attempt at a Solution



So what I did what for the first area i used
I= 1/2I0 and I got .8
then I2= .8cos2(29.6)= .6048
then for I3= .6048cos2(44.0) =.2918
For that last step -- you need to use the angle between the 3rd polarizer's axis and the polarization of the light incident on that polarizer.
 

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