Asta Powerproject® - Construction Project Management Software

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 cmDownload our all-new 4D Model of Project Management PPT to illustrate the rht approach to manage the project and acplish the desired goals.