What is Astronomical telescope?

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It consist of two convex lenses. These lenses are called
object glass and eye piece respectively. A real, inverted
and diminished object is formally the object at its focus.
This image lies with the focus of the eye piece which acts
as a magnifying galss, producing a virtual, erect, enlarged
image of it. The first image this seen is magnified, but
inverted with respect to the object.

Magnigying power = F/f

Where F is focal length of object glass, and f is focal
length of eye-piece.
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