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=Focal Length=

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Concept
The **focal length**of an optical system, is a measure of how strongly the system converges (focuses) or diverges (defocuses) light. A system with a shorter focal length has greater power than one with a long focal length, meaning it bends the rays more strongly, which brings them to a focus in a shorter distance. Whereas with a longer focal length or lower optical power, it is associated with a larger magnification of distant objects, and a narrower angle of view.

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