The First Lab Glass Slab, Prism, Concave Lens and Mirror, Convex Lens

Concave and convex lenses are used in the scientific world and in photography to bend light beams, but they have a more practical application as well. They are used to correct vision disorders such as nearsightedness and farsightedness, or to give the wearer a more attractive appearance by changing the curvature of the lens.

Concave lenses are thinner at their centers than at their edges, where they become thicker. The light beams entering them are bent inward towards the center of the lens, so that when they emerge from it, they converge on each other. These types of lenses can be used for reading glasses.

Convex lenses are thicker at their centers than at their edges, where they become thinner. The light beams entering them are bent outward away from the center of the lens, so that when they emerge from it, they diverge away from each other. These types of lenses can be used for bifocals or eyeglasses for people with farsightedness or presbyopia (the inability to focus close objects). In certain instances, a person may require both concave and convex lens in their glasses in order to see clearly while looking at both nearby and faraway objects.

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