A converging lens has a focal length of 5cm. Determine its power
Answer Details
Power is defined as the reciprocal of the focal length of a lens, expressed in meters and denoted by the unit dioptre (D). To convert from centimeters to meters, we divide by 100. Thus, the power of the lens is:
P = 1/f = 1/0.05m = 20 D
Therefore, the answer is +20.0.