Lens (geology)
https://openalex.org/C15336307
https://www.wikidata.org/wiki/Q1766051
Optics
https://openalex.org/C120665830
https://www.wikidata.org/wiki/Q14620
Superlens
https://openalex.org/C94631461
https://www.wikidata.org/wiki/Q3504693
Slab
https://openalex.org/C113740112
https://www.wikidata.org/wiki/Q5904738
Refractive index
https://openalex.org/C42067758
https://www.wikidata.org/wiki/Q174102
Negative refraction
https://openalex.org/C70324355
https://www.wikidata.org/wiki/Q3454804
Wavelength
https://openalex.org/C6260449
https://www.wikidata.org/wiki/Q41364
Refraction
https://openalex.org/C205318122
https://www.wikidata.org/wiki/Q72277
Focus (optics)
https://openalex.org/C192209626
https://www.wikidata.org/wiki/Q190909
Fourier transform
https://openalex.org/C102519508
https://www.wikidata.org/wiki/Q6520159
Physics
https://openalex.org/C121332964
https://www.wikidata.org/wiki/Q413
Metamaterial
https://openalex.org/C110367647
https://www.wikidata.org/wiki/Q497166
Materials science
https://openalex.org/C192562407
https://www.wikidata.org/wiki/Q228736
Optoelectronics
https://openalex.org/C49040817
https://www.wikidata.org/wiki/Q193091
Giving reasons why a particular method was adopted
This study employs qualitative analysis and natural language processing to …
[INST] Please produce a sentence from the paper. The sentence should not mention the title of the paper, rather it be extracted from the Describing Methods section of the paper.
Please provide one singular full sentence from the paper that serves the function provided, using the example as guidance. Be specific, using relevant terminology from the paper.
Refrain from vague or generic statements. Finally produce a search query in the form of a question targeted towards the knowledge contained therein. 
You must output json with the structure of {'Sentence': sentence, 'Query': query}.
Field: "Optics".
Paper: "Experimental Verification of a Negative Index of Refraction"
Function: "Giving reasons why a particular method was adopted".
Example Sentence: "This study employs qualitative analysis and natural language processing to …". [/INST]