Answer:
The magnification of a telescope can be modified by changing the eyepiece.
Step-by-step explanation:
A telescope's eyepieces are classified by focal length in millimeters, not by magnification. To calculate the magnification of any telescope with a given eyepiece, the focal length of the telescope is divided by the focal length of the eyepiece used. A 25mm focal length eyepiece when used on a 1000mm focal length telescope will produce a 40x magnification. (1000/25 = 40). In fact, these calculations are theoretical, as the effective magnification is approximately 2 times the (objective) aperture of the telescope. Focal Length only defines the brightness of a telescope. If it is more or less luminous than another of the same aperture (objective). If they are of the same aperture, the longer the Focal Length, the less bright the telescope will be. A brighter telescope has better images of stars and brighter (darker) objects, and a brighter telescope has better images of stars and brighter (brighter) objects.