description of a lens?
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- Lenses definition, a piece of transparent substance, usually glass, having two opposite surfaces either both curved or one curved and one plane, used in an optical device in changing the convergence of light rays, as for magnification, or in correcting defects of vision. See more.
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Lens The lens is located in the eye. By changing its shape, the lens changes the focal distance of the eye. In other words, it focuses the light rays that pass through it (and onto the retina) in order to create clear images of objects that are positioned at various distances. It also works together with the cornea to refract, or bend, light. The lens is of ellipsoid, biconvex shape.
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lens 4. a doubly convex, transparent body in the eye, behind the pupil, that focuses incident light on the retina. 5. a body of rock or ore that is thick in the middle and thinner toward the edges, similar in shape to a biconvex lens.
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Cephalopod Photophore Terminology Lenses-A variety of structures that apparently affect the directionality of light are called lenses.. Some of these appear to act like typical optical lenses but the mode of action of others (like those in the illustration to the right) are uncertain.
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Lenticular lens A lenticular lens is an array of magnifying lenses, designed so that when viewed from slightly different angles, different images are magnified.he angle of view of a lenticular print is the range of angles within which the observer can see the entire image. This is determined by the maximum angle at which a ray can leave the image through the correct lenticule.
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lens Medical Definition of LENS. 1. : a curved piece of glass or plastic used singly or combined in eyeglasses or an optical instrument (as a microscope) for forming an image by focusing rays of light.2.: a device for directing or focusing radiation other than light (as sound waves, radio microwaves, or electrons).3.. : a curved piece of glass or plastic used singly or combined in eyeglasses or an optical instrument (as a microscope) for forming an image by focusing rays of light. 2.
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OBJECTIVE LENS Noun. 1. objective lens-the lens or system of lenses in a telescope or microscope that is nearest the object being viewed. object glass, object lens, objective. compound microscope-light microscope that has two converging lens systems: the objective and the eyepiece.
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lens A piece of glass or plastic shaped so as to focus or spread parallel light rays that pass through it to form an image. b. A combination of two or more such lenses used to form an image, as in a camera or telescope. Also called compound lens.
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- Lens Luxation. The lens is located in the central region of the eye where its purpose is to transmit and focus light onto the retina at the back of the eye. The lens is anchored in place by numerous fibres, called lens zonules. If these fibres break down, the lens begins to drift from its central position.
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Lens Lens. The lens is located in the eye. By changing its shape, the lens changes the focal distance of the eye. In other words, it focuses the light rays that pass through it (and onto the retina) in order to create clear images of objects that are positioned at various distances. It also works together with the cornea to refract, or bend, light. The lens is of ellipsoid, biconvex shape. An ellipsoid is similar to a sphere but stretched out, like an olive, and biconvex means it’s rounded outward on both sides.
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Objective (optics) Several objective lenses on a microscope. In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image. Objectives can be a single lens or mirror, or combinations of several optical elements.
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Gravitational lens The aqua circle is a source as it would be seen if there was no lens; white spots are the multiple images of the source. A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.
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Camera lens A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.
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Aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at the image plane.
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eye In vertebrate animals, the eye occurs as one of a pair, each consisting of a spherical structure that is filled with fluid. Incoming light is refracted by the cornea and transmitted through the pupil to the lens, which focuses the image onto the retina.
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Digital camera lens buying guide The first number used to describe a lens is its focal length; in combination with the camera's sensor size, this defines the angle of view covered by the lens, with smaller numbers indicating a wider angle.
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lens Called also diverging lens. contact l's corrective lenses that fit directly over the cornea of the eye; see also contact lenses. converging lens (convex lens) one curved like the exterior of a hollow sphere; it brings light to a focus. convexoconcave lens one that has one convex and one concave face.
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Lens (optics) A lens is biconvex (or double convex, or just convex) if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. A lens with two concave surfaces is biconcave (or just concave). If one of the surfaces is flat, the lens is plano-convex or plano-concave depending on the curvature of the other surface. A lens with one convex and one concave side is convex-concave or meniscus. It is this type of lens that is most commonly used in corrective lenses.
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- Holders of official and diplomatic passports on official business must obtain a visa from a Turkish embassy or consulate before arrival in Turkey. All travelers planning to stay more than three months for any purpose are required to obtain a visa from a Turkish embassy or consulate.Such travelers must also apply for a residence/work permit or Turkish ID card within the first month of their arrival in Turkey.he new regulation will not make any changes to the visa requirements for travel to Turkey but it will affect how long U.S. Citizens can remain in Turkey. The new regulation affects all foreigners who travel to Turkey.
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Thin layer of tissue covering the front of the eye, except t The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, thus allowing a sharp real image of the object of interest to be formed on the retina.
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lens liquid lens The lens formed by the tear layer lying between the back surface of a rigid contact lens and the cornea. It must be taken into account when fitting contact lenses. If the back surface of the lens is steeper than the cornea, the liquid lens is positive and the eye is made more myopic.
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lens noun. 1  a piece of glass or other transparent material, used to converge or diverge transmitted light and form optical images. 2  Also called : : compound lens a combination of such lenses for forming images or concentrating a beam of light.3  a device that diverges or converges a beam of electromagnetic radiation, sound, or particles. ( 4 anatomy) See .... a piece of glass or other transparent material, used to converge or diverge transmitted light and form optical images. 2  Also called : : compound lens a combination of such lenses for forming images or concentrating a beam of light.
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13. THE TELESCOPIC EYE Hence it is the optical media of the eye-cornea, crystalline lens, and aqueous fluid filling the eye-that determine the final shape of the wavefront reaching retinal photoreceptors. Being bio-engineered, eye optics is far from high standards of a quality telescope.
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lens lens (lěnz) n. pl. lens·es. A ground or molded piece of glass, plastic, or other transparent material with opposite surfaces either or both of which are curved, by means of which light rays are refracted so that they converge or diverge to form an image.
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lens Noun. 1. lens-a transparent optical device used to converge or diverge transmitted light and to form images. lens system, lense. anastigmat-compound lens or lens system designed to be free of astigmatism and able to form approximately point images.. a doubly convex, transparent body in the eye, behind the pupil, that focuses incident light on the retina. 5. a body of rock or ore that is thick in the middle and thinner toward the edges, similar in shape to a biconvex lens.
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Lens (optics) Most lenses are spherical lenses: their two surfaces are parts of the surfaces of spheres. Each surface can be convex (bulging outwards from the lens), concave (depressed into the lens), or planar (flat). The line joining the centres of the spheres making up the lens surfaces is called the axis of the lens.