What is the power of a lens? What is the SI unit of the refractive power of a lens?

The reciprocal of the focal length is called the optical power of the lens. In SI, the unit of optical power is diopter (diopter).

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.