## College Physics (7th Edition)

A telescope is supposed to magnify objects, so its angular magnification should be greater than 1. Since magnification is $-\frac{fo}{fe}$, the eyepiece should have a shorter focal length than the objective lens. So we should use the lens with shorter focal length as the eyepiece and the other lens as the objective.
A telescope is supposed to magnify objects, so its angular magnification should be greater than 1. Since magnification is $-\frac{fo}{fe}$, the eyepiece should have a shorter focal length than the objective lens. So we should use the lens with shorter focal length as the eyepiece and the other lens as the objective.