The power of [[1]] lens is considered to be negative.

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Detailed Solution

The power of concave lenses is considered to be negative.
The power of the lens is referred to as the reciprocal of a lens's focal length. Focal length is considered + ve convex lens and - ve for the concave lens. Hence, the power of concave (diverging) lenses is taken as negative. And the power of convex (converging) lenses is taken as positive.

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