Resolving Power:

The resolution, also termed as resolving power, is the capability of a telescope to split two objects which are not in accurately similar place in the sky. It is measured in an angular sense, typically in seconds of arc (units of 1⁄3600 of a degree). The minor the number, the superior is the resolving power.

The finest way to measure a telescope's resolving power is to scan the sky for well-known pairs of stars which are emerge close to each other in the angular logic. Astronomical data charts can establish which pairs of stars to use for this principle. The other technique is to inspect the Moon and use a full map of the lunar surface to ascertain how much detail the telescope can provide.

The resolving power rises with magnification, though only up to a certain point. The greatest image resolution a telescope can give is directly proportional to the diameter of the objective lens or mirror, up to a certain highest dictated by atmospheric turbulence. Additionally, the resolving power based on the acuity of the observer's eyesight (when direct viewing is contemplated) or the roughness of the grain of the photographic or detecting surface (when an analog or digital camera is use).