Presentasi 4DX |

power 4dWin a 4D lottery winning numbers has never been easier and is not based on luck. It's all about math, manipulation, statistic and hardworking study on how to win. Our 4D predictionThe 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 nature