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Focal length is minimum and maximum when , five the formula plzzzzzzzzzzzzz say soonnnnnn |
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Answer» It is not a measurement of the actual LENGTH of a lens, but a calculation of an optical distance from the point where light rays converge to form a sharp image of an object to the digital sensor or 35mm FILM at the focal plane in the CAMERA. The focal length of a lens is determined when the lens is focused at INFINITY. |
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