Noun: refractivity ,ree,frak'ti-vu-tee or ri,frak'ti-vu-tee
- The physical property of a medium as determined by its index of refraction
"The refractivity of the lens affects how light bends through it";
- refractiveness
Derived forms: refractivities
Type of: bending, deflection, deflexion [Brit]
Encyclopedia: Refractivity