scope

an area in which something acts or operates or has power or control: "the range of a supersonic jet"; "a piano has a greater range than the human voice"; "the ambit of municipal legislation"; "within the compass of this article"; "within the scope of an investigation"; "outside the reach of the law"; "in the political orbit of a world power"

the state of the environment in which a situation exists; "you can't do that in a university setting"

a magnifier of images of distant objects

electronic equipment that provides visual images of varying electrical quantities