The power of a lens is +4D. Find the focal length of

power 4dDownload the Monsters presentation for PowerPoint or Google Slides and start impressing your audience with a creative and orinal desn. templates like this one here offerGiven, Power of convex lens=4D. Placed at 40 cm from a wall. To Find, Distance of a candle. Solution, It is given that ,Power = 4D. Then, P = 1f. So, 4 D = 1f