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Identification
A concave lens is defined by its thin middle and thick edges, allowing the light rays reflected to spread out from the lens at angles that generate a right side up image, according to the University of Virginia. This image is smaller than the original object, making the concave lens not as common as the convex, or magnifying, lens. Both can be used together in a variety of optical formations to bend the light accordingly, notes the University of Illinois.
Types
Concave lenses are used in eyeglasses, utilizing both concave and convex lenses, to generate a proper, clear vision for the user. In particular, binoculars and telescopes benefit greatly from the detail concave lenses provide.
Application
According to the University of Virginia, concave lenses used in eyeglasses are useful in treating nearsightedness.