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power 4dDurapower Group offers closed-loop, end-to-end Energy Storage Solutions for a variety of e-mobility, specialty, and stationary applications. Focusing on the manufacturing, research,Transcript. Question 39 If the power of a lens is − 4.0 D, then it means that the lens is a (A) concave lens of focal length −50 m (B) convex lens of focal length +50 cm