11887071 - Lensed galaxies in a cluster13386814 - Putting in a contact lens13403186 - Children participating in a science fair12288363 - Optics of a divergent lens, 19th century12376375 - Light shining through RGB prisms from a projector11718869 - Setting up a microscope11718871 - Setting up a microscope11718868 - Setting up a microscope12290866 - Lentils in test tubes in a test tube rack11718872 - Setting up a microscope12050859 - Compound eye of a fruit fly,SEM11718870 - Setting up a microscope11718867 - Setting up a microscope11822537 - Dried lentils,a type of pulse11909582 - Compound eye of a bee,SEM11562347 - Compound eye of a gnat,SEM11832435 - Microscope objective lenses with a spot o11550134 - Head of a horsefly11550196 - Choosing a pair of glasses11909021 - Compound eye of a mosquito,SEM11628544 - Choosing a pair of glasses11550208 - Choosing a pair of glasses11637375 - Rain drops on a window at sunrise11752393 - Man holding a pair of glasses11908680 - Compound eye of a gnat,SEM11997005 - Optical effect of a concave lens11908672 - Compound eye of a fly,SEM11752394 - Man holding a pair of glasses11550207 - Choosing a pair of glasses11752395 - Man holding a pair of glasses11752391 - Man holding a pair of glasses11752392 - Man holding a pair of glasses12583515 - Lensed quasars, gravitational lensing montage13671811 - Einstein ring, Hubble Space Telescope image12553561 - Gravitational lensing, illustration12644215 - Galaxy cluster and Einstein ring, HST image12644214 - Abell 2537 galaxy cluster, HST image11698738 - Gravitational lensing,conceptual image11675802 - Gravitational lensing,artwork11887077 - Galactic gravitational lensing,HST image11887075 - Galactic gravitational lensing,HST image11887076 - Galactic gravitational lensing,HST image11887277 - Dark matter ring in galaxy cluster11887081 - Galactic gravitational lensing,HST image11887079 - Galactic gravitational lensing,HST image11887078 - Galactic gravitational lensing,HST image11887080 - Galactic gravitational lensing,HST image11887082 - Galactic gravitational lensing,HST image11754092 - Dark matter gravitational lensing11887073 - Twin quasar (Q0957+561)11887074 - Quintuple quasar (SDSS J1004+4112)