refractivity

noun 0.749

refraction

noun 0.707

refractometer

noun 0.696

refractive power

noun 0.689

refractometry

noun 0.665

refractor

noun 0.651

birefringence

noun 0.591

reflectivity

noun 0.567

refracting telescope

noun 0.555

specific gravity

noun 0.554

wavenumber

noun 0.552

relative density

noun 0.550

reflectance

noun 0.533

total internal reflection

noun 0.531

resistivity

noun 0.518

refractory

noun 0.514

viscosity

noun 0.507

reflectometer

noun 0.506