Define the term angular magnification as used in relation to a telescope in normal adjustment

Angular magnification, as used in relation to a telescope in normal adjustment, is defined as the ratio of the angle subtended by the final image at the eye to the angle subtended by the object at the objective lens. In normal adjustment, the final image is formed at infinity. It is given by the formula:

$$M = \frac{f_o}{f_e}$$

where $f_o$ is the focal length of the objective lens and $f_e$ is the focal length of the eyepiece.