p240_ct26_f07 - Physics 240 Fall 2007 Lecture #26 Final...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 240 Fall 2007 Lecture #26 Dr. Dave Winn 2405 Randall [email protected] Final Exam: Friday December 14, 7:30-9:30
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Polarization E and B fields oscillate in particular directions in EM waves The direction of the E field defines the “polarization” of the wave If the source always oscillates in the same direction, it will produce polarized waves. If source oscillations are random, the light will be randomly oriented: unpolarized
Background image of page 2
Unpolarized Light Many common light sources produce EM radiation via random oscillations. (Ex. hot particles colliding in a gas) Light produced at any given instant will be polarized, but the polarization direction changes randomly and VERY quickly
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Interaction with matter: polarizers Some materials, called polarizers , will transmit only light with electric fields oscillating in a particular direction If light polarized in another direction strikes one, it transmits only the component of the E field along its chosen direction This reduces the intensity of the transmitted light ( ) () θ 2 2 0 cos cos before after y I I E I E E = =
Background image of page 4
Very simple polarizer Conducting Bars Absorbed Not Absorbed E E NOTE: They’re usually drawn the other way!
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/04/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

Page1 / 20

p240_ct26_f07 - Physics 240 Fall 2007 Lecture #26 Final...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online