What do you understand by the resolution or resolving power of a lens?

The resolution or resolving power of a lens refers to its ability to distinguish between two closely spaced objects or details in an image. It is a measure of the lens's ability to produce sharp and clear images with high levels of detail and contrast. A lens with high resolution will be able to produce images with fine details and minimal distortion, while a lens with low resolution will produce images that are blurry and lacking in detail. Resolution is typically measured in terms of the smallest resolvable detail, often expressed in terms of line pairs per millimeter (lp/mm) or pixels per inch (ppi).