refracting telescope

noun 0.875

telescope

noun 0.715

radio telescope

noun 0.686

solar telescope

noun 0.654

retroreflector

noun 0.650

riflescope

noun 0.648

reflecting

noun 0.645

parabolic reflector

noun 0.645

refractor

noun 0.630

reflector

noun 0.625

parabolic mirror

noun 0.608

reflection nebula

noun 0.596

radar reflector

noun 0.586

spherical mirror

noun 0.577

reflection

noun 0.568

refractometer

noun 0.564

interferometer

noun 0.549

retinoscope

noun 0.541

compound microscope

noun 0.541

optical astronomy

noun 0.540

observatory

noun 0.531

plane mirror

noun 0.530

telephoto

noun 0.527

refection

noun 0.518

reflex camera

noun 0.518

gravitational lens

noun 0.518

angle of reflection

noun 0.517

reflectivity

noun 0.516

reflectometry

noun 0.516

rear-view mirror

noun 0.516

optical microscope

noun 0.510

theodolite

noun 0.507

microscope

noun 0.506

dioptric

noun 0.506

simple microscope

noun 0.505

reflectometer

noun 0.502

optical flat

noun 0.500