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20 answers for: Instrument for measuring refractive indices (12)
RANKANSWERCLUE
SPECTROMETERInstrument for measuring refractive indices (12)
OPTOMETERFormerly, an instrument for measuring the refractive power of the eye, used when prescribing corrective lenses (9)
GALVANOMETERAn instrument for measuring electric currents (12)
ELECTROMETERInstrument for measuring differences in potential
ELECTROSCOPEInstrument for measuring charge
MAGNETOMETERInstrument for measuring earth's field
DIOPTREUnit for measuring the refractive power of a lens
LASIKOption for treating a refractive error
CRITERIAIndices of quality or fitness for purpose (8)
GAZETTEERSIndices: for example, Street A-Z (10)
ETARefractive-index symbol, in physics
CRYSTALGlass with a high refractive index (7)
LEADGLASSGuide German girl to something refractive
LASERRefractive surgery tool
DIOPTERUnit of refractive power of a lens
STATSGNP, S&P indices, etc.
INSECTICIDECite indices revealing threat to workers and soldiers, say
DECISIONConclusion reached about indices with zero (8)
GLOSSARIESIndices (10)
UNCASEDCut into various indices (7)