Polarized light: Where did the magnetic field go?

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SUMMARY

The discussion centers on the behavior of polarized light as it interacts with polarizing filters, specifically addressing the presence of the magnetic field associated with light. It is established that while diagrams may depict only the electric field emerging from the filter, the magnetic field remains present and is perpendicular to both the electric field and the direction of propagation. The confusion arises from the representation of different polarization states in diagrams, which may lead to the misconception that the magnetic field is eliminated by the filter.

PREREQUISITES
  • Understanding of electromagnetic waves, specifically the relationship between electric and magnetic fields.
  • Familiarity with the concept of polarization in light.
  • Knowledge of how polarizing filters operate.
  • Basic principles of optics and wave propagation.
NEXT STEPS
  • Research the principles of electromagnetic wave propagation, focusing on Maxwell's equations.
  • Study the mechanics of polarizing filters and their effect on light waves.
  • Explore the concept of polarization states and how they are represented in diagrams.
  • Learn about the implications of polarized light in various applications, such as photography and optical devices.
USEFUL FOR

Students preparing for medical school admissions, educators in physics and optics, and anyone interested in the properties of light and electromagnetic theory.

gauss44
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Many of the diagrams of polarized light seem to show light with an electric field and a magnetic field approaching the polarizing filter, but only an electric field coming out of the filter. Where did the magnetic field* go? Does a filter that produces plane polarized light somehow eliminate the magnetic field? Does the magnetic field just pass through the filter unchanged, so long as the corresponding electric field is able to pass through?

*The magnetic field associated with the light that makes it through the filter.

(This question was inspired by an MCAT review book. I am not a student. I am studying for the medical school admissions test, to hopefully make it into medical school.)
 
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It is still present and is perpendicular to the electric field and the direction of propagation. Perhaps your diagram was showing the electric field of different polarization states?
 
Drakkith said:
It is still present and is perpendicular to the electric field and the direction of propagation. Perhaps your diagram was showing the electric field of different polarization states?

That must have been it.
 

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