Go Back   Physics Help Forum > College/University Physics Help > Advanced Waves and Sound

Advanced Waves and Sound Advanced Waves and Sound Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Dec 14th 2009, 07:54 AM   #1
Junior Member
 
Join Date: Dec 2009
Posts: 21
Polarization

Three polarized placaas are superimposed. The first and third are crossed. The polarization direction of the plate means is 45 with the directions of polarization of the other two. What fraction of the intensity of the beam initially non-polarized is transmitted by the system boards?
viciado is offline   Reply With Quote
Old Dec 14th 2009, 08:40 AM   #2
Senior Member
 
Join Date: Sep 2009
Location: india
Posts: 409
malus law application will give u 1/8.
but where is your attempt, friend?
r.samanta is offline   Reply With Quote
Old Dec 14th 2009, 10:18 AM   #3
Junior Member
 
Join Date: Dec 2009
Posts: 21
Originally Posted by r.samanta View Post
malus law application will give u 1/8.
but where is your attempt, friend?

Malus is:
I = I_m cos^2 \theta


I did not understand the problem. Why can not I see the direct application
viciado is offline   Reply With Quote
Old Dec 15th 2009, 05:50 AM   #4
Senior Member
 
Join Date: Sep 2009
Location: india
Posts: 409
SINCE initially light is unpolarised, first polariser will just pass half the intensity
(resolve all E along pass axis and u will see why)
second one allows I/2 cos ^2 theta
third one allows I/2 cos ^2 theta cos^2 theta
put theta. it is 45 in this case for both.
r.samanta is offline   Reply With Quote
Old Dec 15th 2009, 07:04 AM   #5
Junior Member
 
Join Date: Dec 2009
Posts: 21
Originally Posted by r.samanta View Post
SINCE initially light is unpolarised, first polariser will just pass half the intensity
(resolve all E along pass axis and u will see why)
second one allows I/2 cos ^2 theta
third one allows I/2 cos ^2 theta cos^2 theta
put theta. it is 45 in this case for both.

Oh yes, thank you
viciado is offline   Reply With Quote
Reply

  Physics Help Forum > College/University Physics Help > Advanced Waves and Sound

Tags
polarization



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Reflection and polarization Devlan Light and Optics 0 Mar 15th 2012 02:15 AM
[SOLVED] Induced polarization in an atom bnay Advanced Electricity and Magnetism 1 Nov 30th 2010 09:42 PM
polarization vyomictor Light and Optics 1 Sep 9th 2010 02:33 AM
Polarization werehk Light and Optics 4 Nov 18th 2009 06:14 PM


Facebook Twitter Google+ RSS Feed