Polaroid (conceptual doubt)

  • #1
Suyash Singh

Homework Statement


It is just a conceptual doubt

Homework Equations


According to malus law intensity of light through polaroid is
I=(Io)cos^2(theta) where theta is the angle between axis of polaroid and incident light.

The Attempt at a Solution


But when Theta=0 then I=Io but in my book it is I=Io/2.
why??

and also is my diagram below correct?

--->(light)(I) [](polaroid) --->(I/2) [] --->(I/4) (theta=0 degrees for both polaroid)
 

Answers and Replies

  • #2
gneill
Mentor
20,925
2,867
##I_o## is generally taken to be the intensity of the light after an unpolarized source has passed through one polarizer (hence polarizing it). Half of intensity of the source is lost by the first polarization.

Take a look at the diagram for the Law of Malus entry on the Hyperphysics web site:

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/polcross.html#c1
 
  • #3
Suyash Singh
Thankyou :)
 

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