Assertion: telescope's eyepiece | /r/ObjectUse | used with reflector
Facets:
Source sentences:
text: Eyepieces, which are used with both refractors and reflectors (see below Reflecting telescopes), have a wide variety of applications and provide observers with the ability to select the magnification of their instruments.
text: The eyepiece used with a telescope magnifies the image that is formed by the main optical system.
text: It is common for users of an eyepiece to want to calculate the actual field of view, because it indicates how much of the sky will be visible when the eyepiece is used with their telescope.