The ability of a telescope to show two very close objects separately is called its resolving power
Resolving power is the capacity of a lens, be it of a telescope or microscope, to discern between two securely fixed objects at a distance and produce an image of each. Therefore, the optical instrument's capacity to distinguish between and gauge the separation between the two objects depends on its resolving power.
A telescope is a typically tubular optical device for observing distant objects using the reflection of light rays by a concave mirror or the refraction of light rays via a lens
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