Examples from the Web for refractor
Here the spectroscope is now placed, but not, as it happens, on the Thompson refractor.The Royal Observatory Greenwich|E. Walter (Edwared Walter) Maunder
The refractor achieves this by means of a carefully shaped lens, called the object glass, or objective.
Thus the refractor and the reflector differ chiefly in their manner of gathering light.The Outline of Science, Vol. 1 (of 4)|J. Arthur Thomson
With the reflector and the refractor it had been found that the field of good images was strictly limited.Astronomical Discovery|Herbert Hall Turner
In what follows I have only a refractor in mind, although the same principles would apply to a reflector.