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**1. The problem statement, all variables and given/known data**

A beam of unpolarized light with intensity 30 watts/m^2 passes through a polarizing sheet. What is the electric field amplitude of the transmitted beam?

**2. Relevant equations**

Ia=Ipcos

^{2}[tex]\Theta[/tex]

Ea=Epcos[tex]\Theta[/tex]

Ip=Io/2

**3. The attempt at a solution**

I solved the first two equations for cos[tex]\Theta[/tex] and set them equal to each other to get sqrt(Ia/Ip)=Ea/Ep

I know Io is 30, so Ip is 15

So then, I believe I should have sqrt(2)=Ea/Ep and I don't know how to just solve for one without the other...