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The lower half is for near vision. Whether it’s the lens on your cell phone camera, the lenses on the eyeglasses or contact lenses you use to see clearly, magnifying glasses, microscopes, telescopes or something else entirely, the physics of lenses explains how a simple piece of glass can be used to magnify, minimize or bring images into focus for any purpose. Normal lenses range, generally, from 40mm to 60mm in 35mm equivalent terms. This lens approximates the angle of view of the human eye (or so it was long agreed, even though the human eye sees things with a slightly narrower angle of view), so it’s considered to produce a normal view. Types of lenses. The lens is transparent piece of glass or plastic which has a curved surface. In a convex lens (sometimes called a positive lens), the glass (or plastic) surfaces bulge outwards in the center giving the classic lentil-like shape. There are two main types of lenses, known as convex (or converging) and concave (or diverging). Part of Physics (Single Science) Types of lens There are two known types of lens these are: A convex/converging lens; A concave/diverging lens; Convex Lens A convex lens is a type of lens that bends/converges light in, it is also known as converging lens. It is easiest to concentrate on only three types of images—then remember that concave mirrors act like convex lenses, whereas convex mirrors act like concave lenses. You encounter lenses every day. Ray Diagram for Object Located in Front of the Focal Point. The diagram below shows how light is refracted through a convex lens. The upper part helps with distance vision. Lenses are precisely shaped pieces of glass that have been developed and used in corrective glasses, telescopes, microscopes, binoculars, and magnifying glasses. A normal lens, in 35mm film terms, is a 50mm lens. The most common type of multifocal. In the three cases described above - the case of the object being located beyond 2F, the case of the object being located at 2F, and the case of the object being located between 2F and F - light rays are converging to a point after refracting through the lens. ReZoom is a multifocal refractive IOL that distributes light over five optical zones to provide near, intermediate, and distance vision. The lens is split into two sections. Studies show that 80 percent of people who have this type of lens implanted have had no need for eyeglasses or contact lenses. In such cases, a real image is formed. Convex lenses. There are two types of lenses: converging (convex lens) and diverging (concave lens). The principle behind the lens is the refraction of light. The three types of images formed by mirrors (cases 1, 2, and 3) are exactly analogous to those formed by lenses, as summarized in the table at the end of Image Formation by Lenses. 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