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Find the power of a concave lens of foca...

Find the power of a concave lens of focal length 2 m.

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Focal length of concave lens `=-2m`
Power of lens `(P)=(l)/("Focal length of the lens in metre (f)")`
`P=(l)/(f)=(l)/((-2m))=0.5 D`
Power of a concave lens `=-0.5 D`.
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