Difference between Optical and Geometrical length?

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SUMMARY

The discussion clarifies the distinction between Optical length and Geometrical length in the context of Optical Physics. Optical path length varies with the index of refraction, equating to geometrical length only when the index of refraction is uniformly 1. This concept is crucial for understanding phase shifts in coherent light sources, particularly in applications like interferometry.

PREREQUISITES
  • Understanding of Optical Physics principles
  • Familiarity with the concept of index of refraction
  • Knowledge of interferometry techniques
  • Basic grasp of coherent light sources
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  • Research the principles of Optical path length in detail
  • Study the effects of varying indices of refraction on light propagation
  • Learn about phase shifts in interferometry
  • Explore practical applications of Optical Physics in modern technology
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Students of Optical Physics, researchers in photonics, and professionals working with optical systems and interferometry will benefit from this discussion.

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Difference between Optical and Geometrical length!?

I'm having this question since 2 times now in the theoretical part of the exam & still I couldn't find anything about it in the book neither in google.
Can anyone who's more experienced in Optical Physics give me the answer to this please !?
 
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Optical path length depends upon the index of refraction encountered; it is the same as geometrical length when the index of refraction is everywhere equal to 1.

See http://en.wikipedia.org/wiki/Optical_path_length

Optical path length is often used as the difference between two optical paths: then the difference in optical path length - this is used to calculate the phase shift between coherent light sources traveling the two paths, as in an interferometer.
 

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