The astronomical telescope is a system consisting of two lenses. The way to make

Question

The astronomical telescope is a system consisting of two lenses. The way to make calculations is to divide this system into two smaller subsystems, each consisting of one lens. The first system consists of the object, the objective lens, and the intermediate image, which is the image produced by the objective lens. The object is at a distance s1 from the objective lens. The objective lens has focal length f_1. The distance between the objective lens and the (real) intermediate image is Su. Do you expect the image to be on the same side of the objective lens as the object, or do you expect it to be on the other side of the lens?

Explanation / Answer

The astronomical telescope makes use of two positive lenses: the objective, which forms the image of a distant object at its focal length, and the eyepiece, which acts as a simple magnifier with which to view the image formed by the objective. Its length is equal to the sum of the focal lengths of the objective and eyepiece, and its angular magnification is -fo /fe , giving an inverted image.

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