How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?
a) Power is inversely proportional to the focal length; the lens with a focal length of 40 cm
b) Power is directly proportional to the focal length; the lens with a focal length of 20 cm
c) Power is inversely proportional to the focal length; the lens with a focal length of 20 cmd) Power is directly proportional to the focal length; the lens with a focal length of 40 cm