What is Focal length?
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The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light...
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focal length is half of the distance of pole to the centre of curvature. or,half of radius of curvature.
f = R/2
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