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PFG Precision Optics - Precision Optics 12/24 LB
Photonics Dictionary

refractive index liquids

A closely spaced series of well-known chemicals having a refractive index lying between 1.33 for water and 1.95 for a solution of phosphorus in carbon disulfide. They are used to identify powdered minerals, since a transparent powder disappears from view when immersed in a liquid of the same refractive index.
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