Kurser og konsulenter - 4D Academy

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 cmFor the perfect blend, pour one packet of 4D Mix Pack powder into 16-24 ounces of cold water, shake well until fully dissolved, and enjoy. This ensures you