The power of a lens is \(-2D\). The lens is:
Diverging with focal length 0.5 m
The focal length of a lens in metres is the reciprocal of its power: \(f = 1/P = 1/(-2) = -0.5 \, m\). A negative power indicates a diverging (concave) lens, and its focal length has a magnitude of 0.5 m, so the lens is diverging with a focal length of 0.5 m.
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