What is the intensity of the incident of light?

  • Thread starter phy112
  • Start date
  • #1
37
0

Homework Statement



Unpolarized light is incident on a system of three polarizers. The second polarizer is oriented at an angle of 28.0° with respect to the first and the third is oriented at an angle of 45.0° with respect to the first. If the light that emerges from the system has an intensity of 2.1 W/m2, what is the intensity of the incident light?


Homework Equations



is this what you do: 2.1W/m^2 divided by cos^2(21). then divide that answer by cos^2(28) than multiply that anwswer by 2? I can's eem to get the right anwser to cos2(21) and cos2(28) right in my calculator. I need some help

The Attempt at a Solution

 

Answers and Replies

  • #2
Redbelly98
Staff Emeritus
Science Advisor
Homework Helper
Insights Author
12,116
152
You're right except for the 21o. What is the angle between the 2nd and 3rd polarizers?

(Good job catching the final 2x factor, a lot of people miss that on problems like this.)
 

Related Threads on What is the intensity of the incident of light?

  • Last Post
Replies
1
Views
10K
Replies
4
Views
12K
Replies
3
Views
4K
  • Last Post
Replies
1
Views
3K
Replies
3
Views
824
Replies
1
Views
5K
Replies
5
Views
667
  • Last Post
Replies
5
Views
2K
Replies
1
Views
3K
Top