define lense theory
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lens is a transparent medium bound by to reflecting surface is such that at least one surface is covered surface can be spherical cylinder except
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(1) Lens is a transparent medium bounded by two refracting surfaces, such that at least one surface is curved. Curved surface can be spherical, cylindrical etc.
(2) Lenses are of two basic types convex which are thicker in the middle than at the edges and concave for which the reverse holds..
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