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Noun(1) a transparent optical device used to converge or diverge transmitted light and to form images,genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils,(metaphor) a channel through which something can be seen or understood,biconvex transparent body situated behind the iris in the eye,it focuses light waves on the retina,electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons(2) a transparent optical device used to converge or diverge transmitted light and to form images(3) genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils(4) (metaphor) a channel through which something can be seen or understood(5) biconvex transparent body situated behind the iris in the eye(6) it focuses light waves on the retina(7) electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons

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(1) Galileo's telescope had a convex object lens but a concave eye-piece.(2) The eye fluid nourishes the bloodless lens and cornea.(3) The posterior chamber is found behind the iris and in front of the lens and ciliary bodies.(4) The vitreous humor is between the back of the lens and the retina.(5) Zooming the camera lens even further, she saw figures off to the right, walking in front of one of the gray tents.(6) Each cluster acts as a magnifying lens , greatly brightening a quasar's light.(7) Negative refraction implies that a converging lens made from negative-index material should have a concave surface rather than a convex one.(8) The dioptric system includes the cornea, the lens , the aqueous humor within the anterior eye chamber, and the vitreous body.(9) Controlled by software, tiny motors on the lens assembly and spherical camera casing allow the lens to pan and track objects.(10) 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.(11) If your subject is nearby, you can often isolate details with a normal lens or moderate telephoto.(12) The solution to this is to get right next to the glass, so that your camera lens is flush with the glass surface.(13) It could have been a bit of dirt on the lens of the telescope but it was really clear through the viewer.(14) An air bubble in water that is shaped like a normal glass lens would have roughly the opposite effect of the glass lens .(15) Stuff like this makes me want to get a fish-eye lens for my digital camera.(16) The lens of the eye works much like the lens of a camera.