give a realation between focal length and power of lens
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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).
Converging (convex) lenses have positive focal lengths, so they also have positive power values.
Diverging (concave) lenses have negative focal lengths, so they also have negative power values
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