Devices that similarly focus or disperse waves and radiation other than visible light are also called "lenses", such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Lenses are used in various imaging devices such as telescopes, binoculars, and cameras.

Lenses are found in a huge array of optical instruments, ranging from the simple magnifying glass to a camera lens to the lens of the human eye. The word lens derives from the Latin word for lentil bean—the shape of which is similar to that of the convex lens (as shown in ).

2025年2月23日 · lens, in optics, piece of glass or other transparent substance that is used to form an image of an object by focusing rays of light from the object. A lens is a piece of transparent material, usually circular in shape, with two polished surfaces, either or both of which is curved and may be either convex (bulging) or concave (depressed).

2025年4月1日 · Discover Canon's selection of Lenses for all your Canon products including DSLRs, video cameras, and more. Only at Canon U.S.A., Inc.

2025年3月27日 · An easy-to-follow explanation of how lenses bend light, including the two main types of lenses: concave and convex.

2019年5月23日 · Most lenses today are named in a relatively standard way: Brand name, lens type, focal length (in mm), maximum aperture, other lens features/abbreviations. For example, the official name for one of Nikon’s professional zooms is the “Nikon AF-S 24-70mm f/2.8 E ED VR” lens. Canon’s equivalent is the “Canon EF 24-70mm f/2.8 L II USM” lens.

Types of Lenses. The lens classification depends on how the light rays bend when they pass through the lens. The two main types of lenses are: Convex Lens (Converging) Concave Lens (Diverging) Convex lenses are thick in the middle and thinner at the edges. A concave lens is flat in the middle and thicker at the edges.

10 小时之前 · Bausch + Lomb has recalled lenses used during cataract surgery due to complications when the lenses are used, according to an announcement from the Canada-based eyecare company posted on the U.S ...

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2019年12月5日 · Lenses are all around us, from eyeglasses to camera lenses and even the human eye, and they all work on the same physical principles. They refract light, causing the original ray to "bend" towards a "focal point," although converging and diverging lenses work in different ways to produce an image.