Which Index of Refraction is Better for Lenses?

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Discussion Overview

The discussion revolves around the implications of choosing lenses with different indices of refraction, focusing on how this choice affects lens curvature, aberration correction, and overall performance in various applications.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the practical implications of a higher index of refraction, suggesting that it may influence lens design but does not specify a preference without considering other factors.
  • Another participant notes that the curvature of the lens will differ between materials, which could be significant depending on the application.
  • A third participant emphasizes that the choice of material and its index of refraction depends on the specific application, mentioning graded index lenses that correct for aberration.
  • It is proposed that a higher-index lens may require less curvature to achieve the same focal length as a lower-index lens, potentially reducing spherical aberrations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on which index of refraction is better, as opinions vary based on application and specific material properties.

Contextual Notes

Participants acknowledge that factors such as lens curvature and chromatic aberration correction are relevant but do not fully explore how these factors interact with the choice of index of refraction.

edmondng
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What does a higher index of refraction really mean? I know about speed wavelength etc but let's say you have 2 different material to choose and ignoring other variables, and focal length, diameter are all the same between both material, would you choose a lower index refraction or higher.

Thanks
 
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One thing is that the curvature of the lens will be different.
This may or may not be important to you.
For multi element lenses I think they use different materials to correct for chromatic aberration in the final result.
Other than that no idea.
 
Depends on the application and what "material" we're talking about.
Eg. With lenses, they are graded index (which corrects for aberration) which on average has a low refractive index. Lenses that do not automatically correct for chromatic aberration may have a lower or higher index.
 
A higher-index lens will require less curvature to give the same focal length as a lower-index lens. Spherical aberrations will be less severe owing to the reduced curvature.
 

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