# Homework Help: Elliptical partially polarized beam and its intensity

1. May 19, 2012

### mogul28

1. The problem statement, all variables and given/known data
A partially elliptically polarized beam of light, propagating int he z direction, passes through a perfect linear polarization analyzer. When the transmission axis of the analyzer is along the x direction, the transmitted intensity is maximum and has the value of 1.5 I[0]. When the transmission is along the y direction, the transmitted intensity is minimum and has the value of I[0].
(a) What is the intensity when the transmission axis makes angle θwith the x-axis? Does your answer depend on what traction of the light is unpolarized?
(b) The original beam is made to pass first through a quarter-wave plate and then through the linear polarization analyzer. The quarter-wave plate has its axes lined up with the x and y axes. It is now found that the maximum intensity is transmitted through the two devices when the analyzer transmission axis makes an angle of 30° witht the x-axis.
Determine what is this maximum intensity is and determine the fraction of the incident intensity which is unpolarized.

2. Relevant equations

3. The attempt at a solution
first i found V and then used it to find fractional polarization then
I= I[max]((1+pcos2phi)/(1+p))
but i'm lost at b since i dont know how to apply quarter wave plate information to get teh I[max]

Last edited: May 20, 2012