Definition of lens in English:



  • 1A piece of glass or other transparent substance with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope)

    • ‘Light flashed across the round lenses of his glasses.’
    • ‘Most conventional lenses are made of glass, polymer, or other transparent solid materials.’
    • ‘In 1935, Zeiss found a coating of magnesium fluoride on glass lenses dramatically improved image quality.’
    • ‘Galileo's telescope was similar to a pair of opera glasses in that it used an arrangement of glass lenses to magnify objects.’
    • ‘Isaac Newton proposed using a curved mirror, rather than a lens, to magnify the heavens, and reflecting telescopes are nowadays the norm.’
    • ‘I have two pairs of glasses with different coloured lenses for different light conditions.’
    • ‘He was particularly interested in the ideas of improving telescope design by using lenses made up of two different types of glass.’
    • ‘An air bubble in water that is shaped like a normal glass lens would have roughly the opposite effect of the glass lens.’
    • ‘Some of the other options include glass lenses and plastic lenses.’
    • ‘If you wear glasses have your reading lens fitted to your polarized ones.’
    • ‘These foreground clusters act as lenses that magnify the light of the protogalaxies and allow us to detect and study them.’
    • ‘It could have been a bit of dirt on the lens of the telescope but it was really clear through the viewer.’
    • ‘Galileo's telescope had a convex object lens but a concave eye-piece.’
    • ‘Because of the extreme curve of the glasses, the lenses are hard to fit to a frame - and that makes them costly.’
    • ‘His novel idea was to use both mirrors and lenses in his telescope.’
    • ‘His first telescope was made from available lenses and gave a magnification of about four times.’
    • ‘The lens that picks up the light from the focal point is called the eyepiece lens.’
    • ‘Using his experimental abilities, he ground lenses and assembled a telescope.’
    • ‘Each cluster acts as a magnifying lens, greatly brightening a quasar's light.’
    • ‘But what appeared to be a minute particle of dirt on a telescope lens was in fact a rare daylight view of the planet Mercury crossing in front of the Sun.’
    1. 1.1 The light-gathering device of a camera, typically containing a group of compound lenses.
      • ‘But once the officers checked out the tape over the camera lenses, they decided to rewind and review the videos anyway.’
      • ‘Zooming the camera lens even further, she saw figures off to the right, walking in front of one of the gray tents.’
      • ‘The solution to this is to get right next to the glass, so that your camera lens is flush with the glass surface.’
      • ‘Being able to move the camera lens for focusing and zooming would allow picture phones to take clear telephoto shots and focus on objects close-up.’
      • ‘If possible, bring a camera with interchangeable lenses.’
      • ‘All mating trials were video-recorded by using cameras with macrozoom lenses to allow detailed analysis of the mating sequence.’
      • ‘Controlled by software, tiny motors on the lens assembly and spherical camera casing allow the lens to pan and track objects.’
      • ‘If your subject is nearby, you can often isolate details with a normal lens or moderate telephoto.’
      • ‘They proceeded to display cases located at the store's front and stole 18 digital and film cameras along with eight camera lenses.’
      • ‘The Standard lens is actually one of the most neglected lenses in your camera bag.’
      • ‘Stuff like this makes me want to get a fish-eye lens for my digital camera.’
      • ‘With that he tosses the paper across, and goes back to his camera lenses and his camera lens cloth.’
      • ‘We were looking through our camera lenses, and we could see them waving to us and they kept shooting at us.’
      • ‘Scott also plays with lenses, camera speed and some excellent special effects to heighten the impact of the harrowing fight scenes.’
      • ‘Photography is now about computers as much as it is about cameras and lenses.’
      • ‘Store cameras and lenses in padded cases and, in very damp environments, in locking plastic bags or even underwater housings.’
      • ‘Camera lenses, no matter how expensive, are nowhere near as acutely sensitive as the human eye, nor does the camera see colour in exactly the same way.’
      • ‘Of course the best cameras and lenses can produce images of superior technical quality to gear that is less capable.’
      • ‘Some of these were made not simply without lenses but without a camera at all - rather by the direct manipulation of photographic plates.’
      • ‘The lens of the eye works much like the lens of a camera.’
    2. 1.2Physics An object or device that focuses or otherwise modifies the direction of movement of light, sound, electrons, etc.
      • ‘In order to concentrate more light at the aperture, they placed a glass ball lens on the upper side of the tip prior to the assembly step.’
      • ‘The first and second lenses operate jointly to concentrate and collimate the incident light beam.’
      • ‘Negative refraction implies that a converging lens made from negative-index material should have a concave surface rather than a convex one.’
      • ‘Designed much like a compound microscope, the electron microscope uses a beam of electrons focused through magnetic lenses.’
      • ‘Polycarbonate is a tough, transparent thermoplastic that's used to make thin, light lenses.’
    3. 1.3Anatomy
      • ‘The posterior chamber is found behind the iris and in front of the lens and ciliary bodies.’
      • ‘With age, your eyes are less able to produce tears, your retinas thin and your lenses gradually turn yellow and become less clear.’
      • ‘The dioptric system includes the cornea, the lens, the aqueous humor within the anterior eye chamber, and the vitreous body.’
      • ‘The vitreous humor is between the back of the lens and the retina.’
      • ‘The eye fluid nourishes the bloodless lens and cornea.’
    4. 1.4
      short for contact lens


Late 17th century: from Latin, lentil (because of the similarity in shape).