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13.6.1 Focus
Unlike a mirror, a lens has two foci.First focus (F 1 ): It is defined as a point at which if an object (real in case of a convex lens and virtual for concave) is placed, the image of this object is formed at infinity.
Second focus or principal focus (F 2 ): A narrow beam of light travelling parallel to the principal axis either converge (in case of a convex lens) or diverge (in case of a concave lens) at a point F2 after refraction from the lens.
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