The focal length of a lens of power + 4D is

power 4dGiven, 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 = 1fPower RDW Professional Type NR 8004D dengan memiliki 4 cxxnel, dengan speck 4 x 850 watt di 8 ohm 4 x 1850 watt di 4 ohm 4 x 2600 watt di 2 ohm 3200 watt di