refractivity

noun 0.747

refractor

noun 0.742

refractive index

noun 0.707

diffraction

noun 0.696

refractometer

noun 0.692

refractometry

noun 0.678

refracture

noun 0.642

refection

noun 0.628

refracting telescope

noun 0.618

refractive power

noun 0.611

birefringence

noun 0.597

reflection

noun 0.590

reflexion

noun 0.584

reflux

noun 0.579

reft

noun 0.562

reabsorption

noun 0.554

refractory

noun 0.549

fracture

noun 0.548

curvature

noun 0.547

reframe

noun 0.545

angle of reflection

noun 0.545

reflectivity

noun 0.544

reflex

noun 0.544

rarefaction

noun 0.543

refrigeration

noun 0.543

reflow

noun 0.541

deflection

noun 0.540

reverb

noun 0.538

reflecting

noun 0.536

reverberation

noun 0.536

total internal reflection

noun 0.536

friction

noun 0.536

prism

noun 0.534

reframing

noun 0.533

reformation

noun 0.530

diffusion

noun 0.529

bending

noun 0.527

dispersion

noun 0.524

resorption

noun 0.523

aberration

noun 0.522

fresnel

noun 0.521

rectification

noun 0.520

diffraction grating

noun 0.520

wavelength

noun 0.517

relativity

noun 0.517

ray

noun 0.516

retroflection

noun 0.516

absorption

noun 0.514

reflection nebula

noun 0.512

fracturing

noun 0.510

diffraction pattern

noun 0.509

fluorescence

noun 0.508

reflector

noun 0.507

recursion

noun 0.507

optics

noun 0.506

recession

noun 0.506

refinancing

noun 0.506

reflowing

noun 0.506

infraction

noun 0.506

retracement

noun 0.505

inflection

noun 0.505

absorbance

noun 0.504

reflectometry

noun 0.504

divergence

noun 0.504

filtration

noun 0.501

gravitational lensing

noun 0.501