The focal length of the camera lens is 5mm. What is its optical power?

The value characterizing the refractive power of the lens, that is, the optical power is found by the formula: D = 1 / F, where D is the optical power of the lens, F is the distance from the optical center to the main focus of the lens. The focal length is known by the condition of the problem F = 5 mm, we convert millimeters into SI units: F = 5 * 10 ^ -3 m. Substitute the data into the formula: D = 1 / (5 * 10 ^ -3 m) = 200 diopters.