explain the relationship between focal length and power of lens
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The optical power of a lens is equal to the reciprocal of the focal length of the lens. P = 1/f. SI unit of power is dioptre (D) and that of focal length is metre (m).
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If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). ... Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.
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