# Homework Help: Irradiances of polarized and unpolarized beams

1. May 19, 2012

### mogul28

1. The problem statement, all variables and given/known data
A beam of light is composed of a mixture of unpolarized and linearly polarized waves. The beam is analyzed with a polarizer. As the transmission axis is rotated, the transmitted irradiance varies from a maximum I[max] to a minimum of 1/3 I[max]. What is the ratio of the irradiances of the polarized and unpolarized beams?

2. Relevant equations

3. The attempt at a solution
i got the ratio as 1. can u verify my answer?

Last edited: May 20, 2012
2. May 20, 2012

### tiny-tim

hi mogul28! welcome to pf!

show us what you've tried, and where you're stuck, and then we'll know how to help!

3. May 20, 2012

### mogul28

I got the ratio as 1. can you verify my answer?

4. May 20, 2012

### tiny-tim

how do you get 1 ?

5. May 20, 2012

### mogul28

Step 1: find V
Step 2: equate that to the ratio of Ip/(Ip+Iu)

6. May 21, 2012

### Redbelly98

Staff Emeritus