The Sufferfest enters another dimension with 4D Power

power 4dThe power of a lens is +4D. Find the focal length of this lens. An object is placed at a distance of 50 cm from the optical centre of this lens. State the natureFor 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