When a beam of light is passed through a polarizer, it is polarized in

  • Context: Undergrad 
  • Thread starter Thread starter touqra
  • Start date Start date
  • Tags Tags
    Beam Light Polarizer
Click For Summary

Discussion Overview

The discussion revolves around the behavior of light when it passes through a polarizer, specifically addressing what happens to the components of the light that do not transmit through the polarizer. The scope includes conceptual understanding and technical explanations related to the nature of polarizers.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant notes that when light is polarized in a certain direction, the energy of the initial beam is reduced, and questions where the energy associated with the non-transmitted y-direction electric field goes.
  • Another participant suggests that the energy not transmitted through the filter is absorbed by the filter itself, converting to heat.
  • A different participant points out that the behavior of the polarizer affects the outcome, indicating that polaroids absorb non-transmitted components, while beam splitters may transmit one component and reflect another.
  • One participant reflects on the terminology used, indicating that the term "polarizer" could refer to different types of devices, not just polaroids.

Areas of Agreement / Disagreement

Participants express different views on the nature of polarizers and the fate of the non-transmitted energy, indicating that multiple competing views remain without a consensus on the specifics of the discussion.

Contextual Notes

The discussion highlights the dependence on the type of polarizer being referenced, which may influence the interpretation of energy loss and transmission. There is also ambiguity in the terminology used, which may affect the clarity of the discussion.

touqra
Messages
284
Reaction score
0
When a beam of light is passed through a polarizer, it is polarized in a certain direction, say the x-direction. So, the irradiance or the energy of the initial beam is now reduced. The y-direction electric field could not pass through.
So, where has the y-direction electric field gone, which carries some of the energy of the initial beam?
 
Science news on Phys.org
Am I oversimplifying? Or are you asking what happens to the energy that doesn't make it through the filter?

It gets absorbed by the filter itself - as heat.
 
Depends what the polariser is. Polaroids absorb the non-transmitted components, whereas beam splitters for example will transmit one and reflect the other.

Claude.
 
Claude Bile said:
Depends what the polariser is. Polaroids absorb the non-transmitted components, whereas beam splitters for example will transmit one and reflect the other.

Claude.
But he's asking about light passing through polarizers.
 
I took polariser to mean polarising devices in general, but upon reflection it occurred to me the OP may just be referring to polaroids.

Claude.
 

Similar threads

Replies
10
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 17 ·
Replies
17
Views
3K