the distance of force from the optical centre of lens is
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The focal length of an optical system is a distance measure between principal focus and optical centre, it also defines the lens's angular field of view. For a given lens, the shorter the focal length, the wider the angular field of the lens.
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The focal length of an optical system is a distance measure between principal focus and optical centre, it also defines the lens's angular field of view. For a given lens, the shorter the focal length, the wider the angular field of the lens.
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