Light after a Polarizer Question

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Homework Statement


Initially unpolarized light with an intensity of 240W/m2 is incident on a series of two polarizers. What should be the angle between to the axes of the two polarizers such that the transmitted intensity after the second polarizer is 37.5% of the incident one?


Homework Equations



I=I0cos2[tex]\theta[/tex]



The Attempt at a Solution



I1=.5Iocos2[tex]\theta[/tex] (unpolarized light is reduced by halve after the first polarizer)
this can also be written at 2I1=Io

We are given that I2=0.375I1
2I1=Io so I2 really equals 0.75I1

0.75I1 = I1cos2[tex]\theta[/tex]
0.75=cos2[tex]\theta[/tex]
[tex]\theta[/tex] = 30 degrees

Did I do this correctly?
Thanks for all your help...

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Redbelly98
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Looks good!
 

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