Focal Length of a lens can be measured when the lens is focused:
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INFINITY
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The focal length of a lens is determined when the lens is focused at infinity. Lens focal length tells us the angle of view—how much of the scene will be captured—and the magnification—how large individual elements will be. The longer the focal length, the narrower the angle of view and the higher the magnification.
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Focal Length of a lens can be measured when the lens is focused at infinity.
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