What unit is the strength or power of a lens incorrectly measured in?

The strength or power of a lens is correctly measured in diopters. This unit quantifies how much a lens converges or diverges light, with one diopter being equal to the reciprocal of the focal length in meters. When dealing with lenses in optics, it is critical to use the proper units to ensure accurate measurements and effective application in vision correction.

The other options do not apply to the measurement of lens power. Decibels are used to measure sound intensity, centimeters are a unit of length and not suitable for representing optical power, and grams measure mass, which is unrelated to the optical characteristics of lenses. Therefore, recognizing that diopters are the appropriate unit is vital in the context of optics and vision.