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13.6.1 Focus

Unlike a mirror, a lens has two foci.

First focus (F1): 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 (F2): 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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