1)refringence,折射;折射率差2)Refractive index difference,折射率差3)Refractive index variation,折射率偏差4)refractive index error,折射率误差5)specific refractivity,折射率系数;折射率差度6)refractivity[rifræk'tiviti],折射系数，折射性;折射率差
用法例句
Analysis of large refractive index difference of GRIN-rod lenses caused by ion-exchanging;