What type of image is formed when an object is kept at a distance of twice the focal length convex lens?

Lenses are precisely shaped pieces of glass. They have been developed and used in corrective glasses, telescopes, microscopes, binoculars and magnifying glasses.

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< 20 cm and between 20 cm and 40 cm

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The word "lens" owes its origin to the Latin word for lentils, the tiny beans that have from ancient times been an important ingredient in the cuisine of the Mediterranean region. The convex shape of lentils resulted in thier Latin name being coined for glass possessing the same shape.

Because of the way in which lenses refract light that strikes them, they are used to concentrate or disperse light. Light entering a lens can be altered in many different ways according, for example, to the composition, size, thickness, curvature and combination of the lens used. Many different kinds of lenses are manufactured for use in such devices as cameras, telescopes, microscopes and eyeglasses. Copying machines, image scanners, optical fiber transponders and cutting-edge semiconductor production equipment are other more recent devices in which the ability of lenses to diffuse or condense light is put to use.