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Ein=2Eo/(1+e)

Next, consider the situation where the cylinder is tipped so that its axis makes an angle phi to Eo, find a new expression for Ein.

I know I'm supposed to use the continuity conditions that D-perpendicular and E-parallel are continuous at the interface, but I'm confused as to how to go about doing this. I've come up with the equations Eosin(theta1)=Eintsin(theta2) where I think theta1=90-phi.

Thanks in advance.