Question

if the power of a corrective lens is +2.0D then it is a mirror

Answer 1

No.

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Answer 2

If the power is 2D+, then no it is not a mirror.

Converging lenses have positive optical power, while diverging lenses have negative energy.  

Mirrors, however, are merely glass which has been stained with silver to make it reflective; it has nothing to do with power.

Usually, mirrors have no control.