How Does Polarization by Reflection Determine the Refractive Index of Glass?

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Discussion Overview

The discussion revolves around the relationship between polarization by reflection and the determination of the refractive index of glass. Participants explore the application of Fresnel's equations in this context, specifically regarding the intensity of reflected light and its dependence on incident angles.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • The original poster (OP) presents a scenario involving unpolarized light reflecting off a glass surface and seeks to determine the refractive index using intensity ratios observed with a Polaroid.
  • Some participants reference Fresnel's equations as relevant to the problem, suggesting they are necessary for the calculations involved.
  • There is a suggestion that the question may be more suitable for a homework help forum, indicating a potential concern about the appropriateness of the discussion's location.

Areas of Agreement / Disagreement

Participants generally agree on the relevance of Fresnel's equations but do not reach a consensus on the appropriateness of the forum for the question. The discussion remains unresolved regarding the specific calculations needed to determine the refractive index.

Contextual Notes

The discussion does not clarify the specific mathematical steps required to apply Fresnel's equations to the OP's scenario, leaving some assumptions and dependencies on definitions unaddressed.

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Unpolarized light falls on an angle of 37.5 ° with a plan glass surface. The reflected light polarization is examined with a Polaroid. The ratio between maximum and minimum intensity from Polaroid when it is rotated around is 4.0. Which is the refractive of index glass?

I would like to use the equation which relates the Intensity with the incident angles with the refraction angle. But doesn't really find out how.
 
Last edited:
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DrDu said:
The relevant equations are Fresnel's equations:
http://en.wikipedia.org/wiki/Fresnel_equations
Are you sure that this question is not more apt for the homework help forum?

Oh sorry, of course. Wont happen again. Thank you.
 
Since the OP has posted the question in the homework forums, I am locking this thread.
 

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