Assertion: telescope's image | /r/MadeOf | the objective
Facets:
Source sentences:
text: 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.
text: This requires that the image formed by the objective be exactly at the focal length of the eyepiece.
text: Forcing the final image to be at infinity requires the real image formed by the objective to be at the focal length of the eyepiece.