Why Does Adding a Third Polarizing Filter Let Light Pass Through?

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around various "wow" moments and intriguing phenomena in physics that evoke curiosity and wonder. Participants share personal experiences and examples from both theoretical and experimental perspectives, including topics like polarizing filters, photoemission, cosmic rays, and the nature of light.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a demonstration with polarizing filters, noting that while two filters at 90 degrees block light, adding a third filter at 45 degrees allows light to pass, raising questions about the underlying physical explanation.
  • Another participant shares an experience with helium balloons on a train, observing their unexpected forward motion during acceleration, prompting curiosity about the forces at play.
  • A participant recounts an experimental setup involving a photocathode and intense laser light, where unexpected photoelectron emission occurs even with photon energy below the work function, leading to a discussion about two-photon photoemission.
  • Several participants express awe regarding fundamental concepts in physics, such as flight dynamics, superfluidity, and the implications of Maxwell's Equations and special relativity.
  • One participant reflects on the philosophical implications of light behavior in quantum mechanics, particularly regarding interference patterns and the nature of photons deciding their paths.

Areas of Agreement / Disagreement

Participants express a range of personal experiences and insights, but there is no consensus on the explanations for the phenomena discussed. Multiple competing views and interpretations remain, particularly regarding the polarizing filters and the photoemission process.

Contextual Notes

Some discussions involve complex experimental setups and theoretical concepts that may depend on specific conditions or definitions, which are not fully resolved in the conversation.

Who May Find This Useful

This discussion may be of interest to those exploring the conceptual and experimental aspects of physics, particularly in areas related to optics, quantum mechanics, and fundamental physical principles.

  • #31
James Jackson said:
ZapperZ - No no, you can put the 45 degree polarizer on top of the other two. Try it...
I agree with DarkEternal
I had to put the 45 in-between no matter how close.
Let us know what you see on a retest, JJ.

Although, I'd credit the standard test as Zz described it as worthy of a WOW considering it still works even if only one photon at a time is sent through. Classical can’t explain that; and QM only has formulas to predict it on average, but not explain the individual actions.
 
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  • #32
A first wow for me was the single slit diffraction pattern and how it was explained.
 

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