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lenses

Across
consists of a single piece of material
device that similarly refract radiation other than visible light
transparent optical device that affects the focus of a light beam through the refraction
consists of a single piece of material
Down
thick at the center and less thickness at the tips
treat the vision defects
used for formation magnified images of the tiny bodies that can not be seen with the naked eye
thin at its center and more thick at the tips