refractive index

noun 0.749

refraction

noun 0.747

refractive power

noun 0.738

reflectivity

noun 0.695

refractor

noun 0.692

refractometry

noun 0.688

refractometer

noun 0.645

birefringence

noun 0.607

refractory

noun 0.589

reflectance

noun 0.562

transmissivity

noun 0.558

absorptivity

noun 0.552

radiancy

noun 0.552

reactivity

noun 0.551

refracture

noun 0.551

photoreflectance

noun 0.545

refracting telescope

noun 0.543

receptivity

noun 0.542

photoreactivity

noun 0.542

reflection

noun 0.538

reactiveness

noun 0.536

reflectometry

noun 0.535

diffraction

noun 0.532

radiopacity

noun 0.532

radiance

noun 0.530

refulgence

noun 0.529

refection

noun 0.525

nonreactivity

noun 0.524

translucency

noun 0.514

reflection nebula

noun 0.511

readability

noun 0.509

reft

noun 0.508

permittivity

noun 0.508

compressibility

noun 0.508

retractive

noun 0.508

reflector

noun 0.507

lucency

noun 0.507

specularity

noun 0.505

reflecting

noun 0.505

resistivity

noun 0.503

optical activity

noun 0.502

retardance

noun 0.502

electivity

noun 0.500