Originally, light is unpolarized. It then travels through 3 polarizers: the firs

Question

Originally, light is unpolarized. It then travels through 3 polarizers: the first with its transmission axis aligned vertical, the next at a 30 degree angle to the vertical and the last aligned at a 45 degree angle to the vertical (tilted the same direction as the first with respect to the vertical). The original intensity of light is 4 W/m2.

9)  What is the intensity of light after the first polarizer?

4 W/m2

2 W/m2

1.5 W/m2

1.4 W/m2

1.0 W/m2

0 W/m2

10)  What is the intensity of light after the second polarizer?

4 W/m2

2 W/m2

1.5 W/m2

1.4 W/m2

1.0 W/m2

0 W/m2

11)  What is the intensity of light after the third polarizer?

4 W/m2

2 W/m2

1.5 W/m2

1.4 W/m2

1.0 W/m2

0 W/m2

12)  If the second polarizer is aligned at a 45 degree angle to the vertical (just like the third), what is the final intensity of light after the third polarizer?

4 W/m2

2 W/m2

1.5 W/m2

1.4 W/m2

1.0 W/m2

0 W/m2

13)  If the second polarizer is aligned at a 45 degree angle to the vertical (but in the other direction), what is the final intensity of light after the third polarizer?

4 W/m2

2 W/m2

1.5 W/m2

1.4 W/m2

1.0 W/m2

0 W/m2

Explanation / Answer

4

3(4*cos^2(30))

1.5

1

1

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