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Find the focal length of a lens pf power...

Find the focal length of a lens pf power - 2.0 D. What type of lens is this ?

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Given : `P=2 D, f=?`
`f=(1)/(P)=-(1)/(2)=0.5m=-50 m`
Negative sign indicates that the lens is a convex lens which is a converging lens.
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