# Intensity of transmitted light

1. Apr 2, 2009

### phy112

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

Two sheets of polarizing material are placed with their transmission axes at right angles to each other. A third polarizing sheet is placed between them with its transmission axis at 46° to the axis of the first one.

(a) If unpolarized light of intensity I0 is incident on the system, what is the intensity of the transmitted light?
X Io

(b) What is the intensity of the transmitted light when the middle sheet is removed?
X Io

2. Relevant equations

I=.5Io
I=Iocos2theta

3. The attempt at a solution

I am confused on what they want! (the answers are in X Io

2. Apr 2, 2009

### phy112

so i got b is zero(which is correct). is A the same?

3. Apr 2, 2009

### Redbelly98

Staff Emeritus
No, A is different.

Break it up into single steps. You already know what the first polarizer does to intensity. Each addition polarizer transmission depends on it's angle relative to the previous polarizer.

4. Apr 3, 2009

### phy112

i tried every thing and i cant figure it out. is there any more hints

5. Apr 3, 2009

### Redbelly98

Staff Emeritus
Step 1:
What is the intensity after the 1st polarizer?