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Finding Incident Intensity for Unpolarized Light 
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#1
Sep809, 02:46 AM

P: 2

1. The problem statement, all variables and given/known data
Two sheets of Polaroid are placed on top of each other with an angle φ between their pass directions. Calculate be the ratio of transmitted to incident intensity for initially unpolarised light if φ = 30°. I copied the question exactly, I'm pretty sure that typo wasn't on purpose but I left it there anyway. 2. Relevant equations I0 = I'/2 Malus's Law I = I0 cos^2 θ 3. The attempt at a solution I used the equation above to do: = I0 cos^2(30) cos^2(30)=.75 .75 x .75 = .5625 = 9/16 = I0(9/16) not sure if that is right 


#2
Sep809, 05:35 AM

HW Helper
P: 4,433

When the unpolarised light is transmitted through a Polaroid, 50% of light is transmitted. So I' = Io/2
When it passes through second Polaroid, the intensity of transmitted light is I" = Io/2*cos^2(θ) 


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