Assertion: telescope's eyepiece | /r/CapableOf | adjust the sharpness of the focus
Facets:
Source sentences:
text: To adjust the sharpness of the focus, the eyepiece can be moved back and forth.
text: So, This is then magnified to form an image by the eyepiece which is inserted in the other end of the telescope, The eyepiece can be moved back and forth to adjust the sharpness of the focus.