Is there a special term for refractive indices when 1 is subtracted?

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The discussion centers on the concept of refractive indices expressed as n-1 in optics. The user seeks clarification on whether there is a specific term for this representation or if it is simply referred to as the "refractive index." The inquiry is motivated by a desire for deeper understanding rather than immediate homework needs. The mention of electric susceptibility suggests a connection to broader optical principles. Overall, the user is looking for terminology clarification within the context of optics.
richyw
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I have been doing a bit of studying for my optics course and I have often come across refractive indices or materials being presented as n-1 (which often makes a lot of sense). I was just wondering if there was a special term like for this format or if we still call it just the "refractive index"?

Sorry if this is in the wrong section, it's not directly for homework although I will probably use it for homework. It's more just for my own information.

thanks!
 
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