convex lens
Outward-curving optic
A convex lens is thicker in the middle than at the edges, causing light rays passing through it to converge at a focal point.
Found in magnifying glasses, cameras, eyeglasses for farsightedness, and the human eye.
The opposite of a concave lens, which is thinner in the middle and causes light to diverge.
Wave bending between media
- focal lengthLens-to-convergence-point distance
- focal pointCenter of interest
- diopterUnit of focal power
- real imageLight converges to form picture
virtual image · magnification · light rays · convergence · aberration · projection · transparency · prism
Blurred near vision condition
- hyperopiaDifficulty seeing nearby objects
- presbyopiaAge-related near vision loss
- prescriptionMedical dispensing authorization
- optometryEye and lens healthcare
ophthalmology · visual acuity · focus · eye exam · vision correction · refractive error · accommodation · spectacles
Handheld lens for enlargement
- eyeglassesCorrective lenses worn
- reading glassesCorrective lenses for close-up
- telescopeInstrument magnifying faraway objects
- microscopeInstrument for viewing minute objects
binoculars · camera · projector · ophthalmoscope · loupe · overhead projector · spotlights · headlights
refraction
Wave bending between media
- focal lengthLens-to-convergence-point distance
- focal pointCenter of interest
- diopterUnit of focal power
real image · virtual image · magnification · light rays · convergence · aberration · projection · transparency · prism · spectrum
farsightedness
Blurred near vision condition
- hyperopiaDifficulty seeing nearby objects
- presbyopiaAge-related near vision loss
- prescriptionMedical dispensing authorization
optometry · ophthalmology · visual acuity · focus · eye exam · vision correction · refractive error · accommodation · spectacles
magnifying glass
Handheld lens for enlargement
- eyeglassesCorrective lenses worn
- reading glassesCorrective lenses for close-up
- telescopeInstrument magnifying faraway objects
microscope · binoculars · camera · projector · ophthalmoscope · loupe · overhead projector · spotlights · headlights · viewfinder
curved
Smoothly bent, not angular
biconvex · rounded · protruding · cambered · elliptical · arched · aspheric · meniscus
- lensesmultifocal, progressive, single vision, biconvex, contact lenses
- optical devicestelescope, magnifying glass, binoculars, microscope, prism
- convex shapessphere, dome, hemisphere, globe, orb
- lightsunlight, daylight, shine, rays, moonlight
- magnifiersmagnifying glass, loupe, magnifier, reading glass, jeweler's loupe