power 4dTranscript. 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 cmBox4d services offer statistics on 4d and Toto results for Singapore and Malaysia prediction. 4D search,Toto search,4d analysis, winning solution. Box4d Results 4D results ... [