Optical lens power represents its ability to focus rays towards the principal optical center. Lens power is denoted by the letter "C". Lens power is inversely proportional to the focal length; this means that as the focal length increases, the lens power decreases, and vice versa.
Lens power can be calculated using the equation C=1/F, where F represents the focal length. The value of C is positive for converging lenses and negative for diverging lenses.