Related by context. Frequent words. (Click for all words.) 62 prism 58 lens 56 lenses 53 refracted 50 refraction 49 Lenses 49 waveguides 48 crystals 48 eyepiece 48 optic 48 concentric rings 47 polarities 46 parallax 46 optical illusions 46 reflective surfaces 46 geometric forms 46 laser beams 46 optically 46 pinhole 45 globes 45 wavelengths 45 apertures 45 prismatic 45 armature 45 photodiodes 44 hexagons 44 panes 44 superposition 44 reflectors 44 mirror 44 optics 43 hexagon 43 lense 43 crystal 43 spheres 43 stalactites 43 magnification 43 refractive index 43 atoms 43 photons 43 gratings 43 beams 43 reflector 43 tubes 43 viewfinder 42 orbs 42 gradations 42 whorls 42 constellations 42 shapes 42 concentric circles 42 colloidal 42 lattice 42 nanocrystals 41 polarity 41 auras 41 kaleidoscope 41 reflectance 41 nanostructures 41 geometric shapes 41 filaments 41 glass beads 41 convex 41 glass panes 41 electrodes 41 shades 41 angles 41 cubes 41 mirrors 41 nanostructure 41 nebulae 41 polarization 40 rays 40 spherical 40 louvers 40 telescopes 40 micrometer 40 camera lens 40 quantum dot 40 microspheres 40 strands 40 aluminum oxide 40 kaleidoscopic 40 hexagonal 40 magnifier 40 spectra 40 infrared wavelengths 40 orb 40 reflections 40 aperture 40 fluorescence 40 mosaics 40 triangles 40 lasers 40 sculptures 40 mosaic 40 magnifying glasses 40 scanning electron microscope 40 diodes 40 quantum dots 40 rectangles