# I Quarter-wave plates and Half-wave plates

Tags:
1. Oct 12, 2016

### boby96

Hi, I am aware that quater-wave plates create a phase shifts of λ / 4 between the fast and slow transmission axis. My question is what happens if we place two quater-wave plates in series so that there is 0 degrees between the fast transmission axis and how would result change if they where placed in series so that there is 90 degrees between fast transmission axis?

Thanks,

2. Oct 12, 2016

### Staff: Mentor

Is this a homework question?

3. Oct 13, 2016

### Andy Resnick

Just multiply the Jones matrices and you will find the answer.

4. Oct 14, 2016

### boby96

No, just that I have covered normal polarisers in series and know how to predict outcome. So was curious if there was any easy and intuitive way of combing quarter wave plates together.

Thanks, does it matter in what order i multiply them in?

5. Oct 14, 2016

### Andy Resnick

Yes, because they are matrices. If the light first goes through retarder '1', then the system matrix is [T]=[2][1]