Why Does Laser Light Bend in a Spring?

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    Bending Light
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Discussion Overview

The discussion revolves around the phenomenon of laser light bending within a spring, particularly in the context of total internal reflection and the behavior of light as it interacts with different materials. Participants explore the underlying principles and mechanics of this optical behavior.

Discussion Character

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

Main Points Raised

  • One participant expresses confusion about why laser light bends in a spring and questions whether this behavior occurs in all springs.
  • Another participant introduces the concept of total internal reflection, referencing Snell's Law and the transition of light between materials with different indices of refraction.
  • A subsequent post questions why the light ray reflects back into the spring rather than returning to the water, indicating a need for clarification on the mechanics involved.
  • Further clarification is provided regarding the nature of total internal reflection, likening it to ordinary reflection from a mirror and explaining the directional behavior of light rays upon reflection.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific mechanics of why the light behaves as it does in the spring, indicating that multiple views and questions remain unresolved.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the properties of the materials involved and the specific conditions under which total internal reflection occurs.

Oomph!
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Hello.
I saw this experiment:

The light from laser is bending in small hole and moving in spring. I don't understand why.
Please, can you tell me why? Why does spring moving in spring, not in air? It will happens in each spring? Why it occurs?

Thank you very much
 
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Like the description on the video says, this is called "total internal reflection."

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/totint.html

http://en.wikipedia.org/wiki/Total_internal_reflection

A Google search finds many other pages about it.

The basic explanation for it is the behavior of Snell's Law (which describes the refraction of a light ray at a boundary) when the light travels (or tries to travel) from a material with a higher index of refraction (e.g. water) to a material with a lower index of refraction (e.g. air).
 
The ray reflect back to the watter, not to air because it is total reflection, OK. So, why the ray don't go back to the watter in the bottle but go to the spring?
 
Total internal reflection is like ordinary reflection from a mirror. When a light ray hits a mirror at a glancing angle (not "head-on") it doesn't come backwards on itself.

More precisely, a mirror reverses a light ray only along the direction perpendicular to the mirror surface, not along the direction parallel to the mirror surface.
 

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