Question

The ability of a telescope to separate two closely spaced stars is called _____.

Answer 1

The ability of a telescope to separate two closely spaced stars is called (angular) resolution.

What is a telescope ?

Astronomers use a telescope to observe distant things. Curved mirrors are used by the majority of telescopes, including all large telescopes, to collect and concentrate light from the night sky. The original telescopes employed lenses, which are simply curved pieces of clear glass, to focus light.

The capacity of a telescope to distinguish two point sources into distinct pictures is known as resolution. The resolving power is constrained by diffraction effects in ideal circumstances, such as above the atmosphere where there is no turbulence (seeing).

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