Optics
Telescope Magnification
The angular magnification of an astronomical (refracting) telescope. The negative sign indicates an inverted image.
Variables
Munitless
Angular magnification
f_om
Focal length of objective
f_em
Focal length of eyepiece
Derivation
Derived from the ratio of the angle subtended by the image to the angle subtended by the distant object. The objective forms an image at its focal point, which coincides with the focal point of the eyepiece.
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