{"id":"S2007010990","label":"Negative refractive index","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2007010990","normalized_label":"negative refractive index","broader":["http://id.loc.gov/authorities/subjects/sh85112261"],"aliases":["Negative index of refraction","Negative refraction index"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2007010990","provider":"lcsh","revision":"e486949c4d7d108d","taxonomy_revision":"f050b5d4780b1289","title":"Negative refractive index","url":"/topics/S2007010990","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"13873479673646047840","address_version":"morton4x16-v1","coordinates":[0,478,33338,47104],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}